Indymogul.com-Great for those homebrewe movie makers that need cheap efficient props
Kipkay.com-Good for relativley cheap weekend projects
http://www.youtube.com/user/makemagazine?blend=1&ob=4-Fun, more expensive weekend projects and good source for learning about electronic components.
Instructables.com-Anything and everything you want to do-whether you want to make a lightsaber or making easter baskets
Wonderhowto.com-Like instructables but it comes with videos.