If you are the least bit interested in geeky stuff you should be following Adam Savage on Twitter. I’d follow him even if he wasn’t a celebrity because his “tweets” are interesting. In addition to comments about what’s going in San Francisco and occasional hints about upcoming episodes of Mythbusters he often links to cool stuff like these two videos. One about 100 years of special effects and this… I don’t know what it is but I want to play with it.