[Spimoles]

Opera Mini is free and a quick browser to use. File access which means you can upload files to the web and the rendering is done server-side so quick browsing for you.Its downside is that it can be a pain to get to (Open Java->click applications -> Lanch Opera Mini) That being said I still use it a lot

Opera Mobile 9.5is free(for now) and also quick rendering, looks great and great browsing. It's downside is that its still in beta so its verry buggy being this is only build1. Gets a low memory notification after 5-10minutes of browsing.

I can't speak for Skyfire because I haven't been able to d/l it but its free as well but its also just a beta build.I believe you have to receive and invite to d/l it.