I have been playing with my starter for quite a while and one of the tests I did was to dry it and re-activate it. The easiest way that I found is to feed it so it's very active, then i smeared a light coating all over the inside of a cottage cheese container. I left it at room temp near the stove and let it dry. It dried fairly quickly (less than 24 hours) and then, when I squeezed the container, the dried starter came off easily so that I could break it up and stick it in a plastic bag. I refrigerated some of it, and just put some into the pantry. Both re-activated nicely after 6 months storage, but the fridge is probably the safer way to go. I haven't played with putting it in the freezer, so can't answer that question.
Hope that helps...