Luke mundy, a buddy of mine, used Twittelator Pro and was showing me cool features that it has. The absolute best thing about it is it's ability to create subgroups. So now I can follow that random business mogul or celebrity but they don't clog up my stream of people that I actually care about.
My biggest negative so far is that it is quite a bit slower than Twitterfon, but we'll see. I've got $4.99 invested in it now!