Last game(s) that I bought was the Humble Indie Bundle #3. I haven't even had a chance to play the HIB #2 that they gave to me later, much less any of the other ones. Possibly the 2nd best $7.00 purchase I've ever made (#1 was Oblivion GOTY on sale on Steam).
Hopefully, I'll be pre-ordering The Old Republic next. Once I get a mailing address for my college dorm, I'll be placing my order at Amazon.com. Or, if you mean the next game I plan on buying, and then playing, it'd be Deus Ex: Human Revolution. I'll wait until a few reviews are out, but I'm keeping a very close eye on it. It looks promising.