I haven't done anything with Arduino yet, but it has stimulated my imagination. When I was a kid did quite a bit of hobby-electronics and recently I've been wanting to re-learn about electronics after 30 years of doing nothing more than occasionally re-soldering some bad connectors. So I was really happy to see an interesting Kickstarter project for an Arduino learning kit... it struck me as just what I needed to get going. Unfortunately there are only a few days left and the project it only half funded.
Please take a look at it and spread the word if you like it. Search for "Arduino learning" on Kickstarter.
:j