One short I had good luck with a while ago was Hutchinson Technology (HTCH), but it has gotten so battered, I stopped trading it. I still looked at it each day, wistful that it was too low to short responsibly.
Well, yesterday it shot up huge, and I saw a second chance to get in. I've covered the position today for about a 13% gain, but I just wanted to point this out as an example of taking advantage of a battered stock which, for whatever reason, has a massive one-day pop.
Here's a daily chart, so you can see this pop in context of longer-term price action.