There are several kinds. A soft clear shell type case, plus a case that clips on your belt and just holds it. I particularly don't like that one since it really is just a carry case, you can't actually use your Touch while it is inside it.
Also a neoprene style sport case with arm strap.
By far, the leather case is the best. Very tight fit, easy to access the screen and the belt clip is very low profile so you can still drop in your pocket without it being bulky.
Interestingly though, the picture on the box of the leather case, shows the flip side of the case having a clear plastic pocket for money/cc etc...actually, the case only has a small leather slip pocket. I actually like that better, but it is not what the picture shows.
Overall, i give the flip leather case an 9 outta 10 on my expectation scale.