Don't hold your breath on Meebo. It might take them a long time to release their app. I was reading some info about the release date on their app and one of the developers said they're still working on a release but have no clue when it will be ready.
Going to have to throw my 2 cents in for BeeJive as well. I've had it since it came out on the iPhone and have loved it. I've used IM+ and there are a few things I do like, twitter integration and the graphic interface. BeeJive has just been the most stable I've used. Very Happy