"Nighthaxen" on blade forums makes some really cool ones that he calls lime cutters. Some have a bottle opener on one one end and some do not. I've been trying to get my hands on one for a while now, but they sell out really quick. They also come with a nice pocket sheath that his wife makes.
If u want to go cheap the kershaw shuffle is a small folder and has a bottle opener on it.
this one from Michael Morris finds it's way into my pocket quite often
Now I think I "need" one of these too. One of my friends has one with carbon fiber scales that was pretty nice. Had never heard of this maker before, then twice in once week. Some neat stuff on his site too.