I know I'm about 5 years behind the curve here but on a whim (after a suggestion in IRC) I bought the Sparkfun Inventor's Kit as something for me and my 10yo to mess around with during the school hols. We played with it for about 3 hours today and had a lot of fun turning LEDs on and off, spinning servo arms, writing rude messages on the LCD screen etc. So we're up to speed with the concepts but there's not too many other interesting projects in the manual as they're all pretty basic stuff. But we're keen to do more with it and don't mind buying a few more bits and bobs. So, short of simply googling for more interesting projects, what's a good step from here? Has anyone got any cool projects they've done, or seen, etc? Is there a good next-step book/website for projects once you tire of the absolute beginner stuff?