I took a photoshop workshop this weekend (Blogshop, SO. FUN.) and all the graphic designers had this Wacom Bamboo Tablet.
Even if you aren't an artist, you'll find tons of awesome uses for it - after the first of two days of my class, I ran to the store and picked one of these little guys up!
If you have any program with a paintbrush (paint, photoshop, etc.) this stylus and pad will help you draw on photos and your fun little designs. Photoshop users can edit and retouch photos, mask shapes and create total masterpieces. The pad comes with its own software too, with games and other cool uses.
If you're even relatively creative, you'll LOVE it. Here's something I made. You have no idea how fun it was to draw this arrow:
I also retouched tons of photos, but I'm not showing you the befores and afters.