Super simple implementation stubber. Point it at a .h file.

Stubby.py

#!/usr/bin/env python

import sys

f = open(sys.argv[1])
output = ""
for line in f:
	if line[0:10] == "@interface":
		colonIndex = line.find(":")
		implLine = line
		if colonIndex is not -1:
			implLine = line[0:colonIndex]
		output += implLine.replace("@interface", "@implementation").strip()
		output += "\n"
	if line[0] in ("-", "+"):
		output += "\n"
		impLine = line.replace(";", "")
		output += impLine
		output += "{\n\n}\n\n"
	if line[0:4] == "@end":
		output += "@end"

print output

# Usage
# $ python ./stubby.py /path/to/objc/Class.h
# For copy/paste, pipe it to pbcopy