I use Tuff-Luv cases for 3 out of 4 of my readers.
This is the one on my PW2, and I've got a blue version of the same style for my Kobo Touch (and a black floral one for my Sony PRS-T1). I like them - they're reasonably priced and just work (they're pretty thick but lightweight). After the fiasco with the PRS-T1's original case (I had to basically break the case to get the device out), I decided that I needed something that was easy to take the device out of, and Tuff-Luv won.
Just throwing that brand into the pile for people looking for a new case.