Mine is teeny tiny and is "all weather". I carry it in my jersey pocket. It's super easy to use and takes good pictures. You can see it here It also takes nice movie clips with sound.

The deal with the real small ones is that they may not have viewfinders, as with mine. So if you're particularly blind (as I am), it can be bothersome if the light is really bad or whatever. They try to make up for it by having a larger screen on the back.

That being said, I have a larger Fuji that takes better pictures. But I like this other better for riding because it is so very small.