Interesting to hear about people's experiences. I was talking with a potential bike touring buddy yesterday and we were discussing ideas for doing some trips next year, and Warmshowers came up in the conversation. I think the concept is cool, but it's hard to make the leap of trusting total strangers...especially when thinking about hosting as a single woman. I think that would have to be limited to having someone camp in the yard rather than letting them into my house. The good thing as a guest is that you always have the option of saying "thanks but no thanks" if you feel uncomfortable for any reason. Personally, I think that if I were traveling with a buddy I would be more open to using Warmshowers than if I were solo.
2011 Surly LHT
1995 Trek 830