I just bought some one ball jay soy wax, since I was running low and read a couple of threads about how the flourocarbons in waxes get in the snow and then into the streams. I like hiking in the mountains in the off season and hate to think that my riding is polluting those beautiful mountain streams.
Just a though, if you're eco-conscious at all. Bluebird has some eco-friendly wax, as well as most other companies. Haven't used mine yet, but from what I've read, you'll want to scrape it while still warm - the stuff is hard and lasts quite a while too.