I just found this interesting talk with Scott Lemon http://scratch.mit.edu/users/Humancell on IT Conversations about Scratch, and how his five year old son is already using it: http://itc.conversationsnetwork.org/shows/detail3422.html
I'm posting this in the educators sections because he's also talking about how good it would be to introduce Scratch into schools.
He's also talking about Squeak and some other Squeak-based platforms (Croquet, E-Toys, Plopp, Plopp SL), plus he's blogging (there's even an entry about Scratch: http://the.inevitable.org/anism)
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