diff --git a/accounts/abi/abi.go b/accounts/abi/abi.go
index de3128902..3f05bfe2d 100644
--- a/accounts/abi/abi.go
+++ b/accounts/abi/abi.go
@@ -36,7 +36,7 @@ import (
 type Method struct {
 	Name   string
 	Const  bool
-	Input  []Argument
+	Inputs []Argument
 	Return Type // not yet implemented
 }
 
@@ -49,9 +49,9 @@ type Method struct {
 // Please note that "int" is substitute for its canonical representation "int256"
 func (m Method) String() (out string) {
 	out += m.Name
-	types := make([]string, len(m.Input))
+	types := make([]string, len(m.Inputs))
 	i := 0
-	for _, input := range m.Input {
+	for _, input := range m.Inputs {
 		types[i] = input.Type.String()
 		i++
 	}
@@ -104,7 +104,7 @@ func (abi ABI) pack(name string, args ...interface{}) ([]byte, error) {
 
 	var ret []byte
 	for i, a := range args {
-		input := method.Input[i]
+		input := method.Inputs[i]
 
 		packed, err := input.Type.pack(a)
 		if err != nil {
@@ -129,8 +129,8 @@ func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) {
 	}
 
 	// start with argument count match
-	if len(args) != len(method.Input) {
-		return nil, fmt.Errorf("argument count mismatch: %d for %d", len(args), len(method.Input))
+	if len(args) != len(method.Inputs) {
+		return nil, fmt.Errorf("argument count mismatch: %d for %d", len(args), len(method.Inputs))
 	}
 
 	arguments, err := abi.pack(name, args...)
diff --git a/accounts/abi/abi_test.go b/accounts/abi/abi_test.go
index 7706de05d..96dd3ee62 100644
--- a/accounts/abi/abi_test.go
+++ b/accounts/abi/abi_test.go
@@ -18,35 +18,38 @@ package abi
 
 import (
 	"bytes"
+	"fmt"
+	"log"
 	"math/big"
 	"reflect"
 	"strings"
 	"testing"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
 )
 
 const jsondata = `
 [
 	{ "name" : "balance", "const" : true },
-	{ "name" : "send", "const" : false, "input" : [ { "name" : "amount", "type" : "uint256" } ] }
+	{ "name" : "send", "const" : false, "inputs" : [ { "name" : "amount", "type" : "uint256" } ] }
 ]`
 
 const jsondata2 = `
 [
 	{ "name" : "balance", "const" : true },
-	{ "name" : "send", "const" : false, "input" : [ { "name" : "amount", "type" : "uint256" } ] },
-	{ "name" : "test", "const" : false, "input" : [ { "name" : "number", "type" : "uint32" } ] },
-	{ "name" : "string", "const" : false, "input" : [ { "name" : "input", "type" : "string" } ] },
-	{ "name" : "bool", "const" : false, "input" : [ { "name" : "input", "type" : "bool" } ] },
-	{ "name" : "address", "const" : false, "input" : [ { "name" : "input", "type" : "address" } ] },
-	{ "name" : "string32", "const" : false, "input" : [ { "name" : "input", "type" : "string32" } ] },
-	{ "name" : "uint64[2]", "const" : false, "input" : [ { "name" : "input", "type" : "uint64[2]" } ] },
-	{ "name" : "uint64[]", "const" : false, "input" : [ { "name" : "input", "type" : "uint64[]" } ] },
-	{ "name" : "foo", "const" : false, "input" : [ { "name" : "input", "type" : "uint32" } ] },
-	{ "name" : "bar", "const" : false, "input" : [ { "name" : "input", "type" : "uint32" }, { "name" : "string", "type" : "uint16" } ] },
-	{ "name" : "slice", "const" : false, "input" : [ { "name" : "input", "type" : "uint32[2]" } ] },
-	{ "name" : "slice256", "const" : false, "input" : [ { "name" : "input", "type" : "uint256[2]" } ] }
+	{ "name" : "send", "const" : false, "inputs" : [ { "name" : "amount", "type" : "uint256" } ] },
+	{ "name" : "test", "const" : false, "inputs" : [ { "name" : "number", "type" : "uint32" } ] },
+	{ "name" : "string", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "string" } ] },
+	{ "name" : "bool", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "bool" } ] },
+	{ "name" : "address", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "address" } ] },
+	{ "name" : "string32", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "string32" } ] },
+	{ "name" : "uint64[2]", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint64[2]" } ] },
+	{ "name" : "uint64[]", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint64[]" } ] },
+	{ "name" : "foo", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32" } ] },
+	{ "name" : "bar", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32" }, { "name" : "string", "type" : "uint16" } ] },
+	{ "name" : "slice", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32[2]" } ] },
+	{ "name" : "slice256", "const" : false, "inputs" : [ { "name" : "inputs", "type" : "uint256[2]" } ] }
 ]`
 
 func TestType(t *testing.T) {
@@ -344,3 +347,49 @@ func TestPackSliceBig(t *testing.T) {
 		t.Errorf("expected %x got %x", sig, packed)
 	}
 }
+
+func ExampleJSON() {
+	const definition = `[{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"isBar","outputs":[{"name":"","type":"bool"}],"type":"function"}]`
+
+	abi, err := JSON(strings.NewReader(definition))
+	if err != nil {
+		log.Fatalln(err)
+	}
+	out, err := abi.Pack("isBar", common.HexToAddress("01"))
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	fmt.Printf("%x\n", out)
+	// Output:
+	// 1f2c40920000000000000000000000000000000000000000000000000000000000000001
+}
+
+func TestBytes(t *testing.T) {
+	const definition = `[
+	{ "name" : "balance", "const" : true, "inputs" : [ { "name" : "address", "type" : "bytes20" } ] },
+	{ "name" : "send", "const" : false, "inputs" : [ { "name" : "amount", "type" : "uint256" } ] }
+]`
+
+	abi, err := JSON(strings.NewReader(definition))
+	if err != nil {
+		t.Fatal(err)
+	}
+	ok := make([]byte, 20)
+	_, err = abi.Pack("balance", ok)
+	if err != nil {
+		t.Error(err)
+	}
+
+	toosmall := make([]byte, 19)
+	_, err = abi.Pack("balance", toosmall)
+	if err != nil {
+		t.Error(err)
+	}
+
+	toobig := make([]byte, 21)
+	_, err = abi.Pack("balance", toobig)
+	if err == nil {
+		t.Error("expected error")
+	}
+}
diff --git a/accounts/abi/type.go b/accounts/abi/type.go
index b16822d3b..16d7491e7 100644
--- a/accounts/abi/type.go
+++ b/accounts/abi/type.go
@@ -43,7 +43,7 @@ type Type struct {
 	stringKind string // holds the unparsed string for deriving signatures
 }
 
-// New type returns a fully parsed Type given by the input string or an error if it  can't be parsed.
+// NewType returns a fully parsed Type given by the input string or an error if it  can't be parsed.
 //
 // Strings can be in the format of:
 //
@@ -130,6 +130,10 @@ func NewType(t string) (typ Type, err error) {
 			if vsize > 0 {
 				typ.Size = 32
 			}
+		case "bytes":
+			typ.Kind = reflect.Slice
+			typ.Type = byte_ts
+			typ.Size = vsize
 		default:
 			return Type{}, fmt.Errorf("unsupported arg type: %s", t)
 		}
@@ -200,7 +204,13 @@ func (t Type) pack(v interface{}) ([]byte, error) {
 		} else {
 			return common.LeftPadBytes(common.Big0.Bytes(), 32), nil
 		}
+	case reflect.Array:
+		if v, ok := value.Interface().(common.Address); ok {
+			return t.pack(v[:])
+		} else if v, ok := value.Interface().(common.Hash); ok {
+			return t.pack(v[:])
+		}
 	}
 
-	panic("unreached")
+	return nil, fmt.Errorf("ABI: bad input given %T", value.Kind())
 }