[Weepy]

Awesome, it really shows off you technical abilities. Definately a cool thing to put all over a site.

However, alot of people just laugh at the photoshop gradient tool.
The 'cut out' version doesn't capture the same look as the original design did, so here's my suggestion:

Redraw the robot at a dynamic angle, maybe at a top/side view while looking up. Also, do some shading within the lineart. Basically, get a paper/pencil illustration and ink it in illustrator, slap some solid colors on it, and you'll have something perfect for t-shirts.

That's my two cents. Very cool overall!!