I've found myself in the habit of referring to 2010 as "010" (oh-ten). And I feel stupid. Anyhow, The Unofficial Scorer looks at the options for the Astros infield in 2010. It's too lengthy to post in its entirety, so read it, and I'll give you the gist:
I would find it highly unlikely to see Tejada, Blum and Boone all again, so there should be at least one new arrival.