Well, having looked at the other thread and also at Tim's page, I think I will stick with SoundCloud for now. Reverbnation seems to have a somewhat cluttered interface - not unlike myspace, and I didn't like the sound of all the promo material. It sounded over pushy to me and I don't like pushy.

I still have plenty of room on SoundCloud, they don't pester you, it's easy to use and has a relatively uncluttered interface.