Sites with information, parts, or just more great customs.
KB Customs does some amazing airbrush work. The best part is that they are willing to help you learn about using an airbrush. You can also get the flame masks there to help you get that awesome flame look like they do.
Rude Customs sells a lot of customs but they also have galleries of customs if you are looking for ideas.
Hot Wheels Collectors is THE site for Collectors. They are the ones who do the club cars and they have great forums. There is all kinds of information to be had here even if it's not specifically customizing.
JP does this work by hand with a jewelers saw. It's well worth checking out his site 2Fast4U
Talk about intricate work There are some amazing customs at 68customs.com. It just blew me away.
WOW!!! Dave Chang's site has a full size Custom Nomad. This thing is just amazing. There are also links to other full size Hot Wheels Themed cars.
Need Wheels, spectraflame paint, hoods, motors, decals, or anything else for restoring an old redline? Here is the place. I have bought several parts from them and never been disappointed.
How-to articals both basic and advanced. I really like the one on fixing windows. Below is a before and after picture of a window I would have tossed. They walk you through fixing it step by step.