Definitely buying NHL. I've played the demo many times but could never justify the $10 when I own NHL 09 already. At $5, though, I can't say no any more.
May end up buying wipeout and flock as well. I liked flock, but really felt it was overpriced at $14.99.
Interested in Crash Commando at that price too. It got pretty decent reviews, but I'm not sure how many people are still playing online. I'm guessing not tons, thought I'm sure a few more with the sale.
Really was expecting to see Flower in the summer sale. Oh well, I guess I'll keep waiting. I really wish it was PixelJunk Monsters in the sale instead of Eden too, but that's only because I don't own Monsters yet
EDIT
For those on the fence, all of the games except Brain Challenge have a demo available and feature trophies