Here are some of them places we have book marked over the years.
CamBam: A great CAD/CAM program that fits the hobbyist budget while providing great functionality. It is our #1 choice for generating GCode.
CarveWright: Home of the easy to use CNC wood working machine.
Mach 3: The standard in PC based CNC control programs.
Taig Owners Club: The most informative and most friendly Taig site around.
Warp 9 Tech Design: Home of the world famous SmoothStepper.