Those of you on Twitter or interested in space exploration and history and junk like that, Astronaut Tim Kopra has become the first person to Twitter from space. Not exactly "one small step" but a space milestone is a space milestone. He hasn't said much, yet; the actual first Twitter from space is about as content-rich as any Twitter:
What a fun shuttle mission - especially w 13 people on board station. Life here is amazing - still getting used to floating!
For anyone interested, Tim Kopra's twitter page is:
http://twitter.com/astro_tim and the full article from NASA can be found
here. There. I feel like I've just justified my subscription to the NASA Media release mailing list. :-D