AtLast Software releases SketchUp 4.0 which is an incredible tool for quickly working in 3D. It is best suited for architectural type design, but can be used to create models for games or to import into 3D Studio Max.

kevin rose has some great t-shirts which you can buy from his site. Kevin is a host of the show "The ScreenSavers" on what is now G4-TechTV. Kevin has another site for the hacker in all of us, thebroken.org.

While looking for geodesic dome suppliers I found this cool Garden Dome 2 Treehouse which looks like it would be great design for a treehouse. I also came across a great supplier of a material called Coroplast which is a corrugated plastic.