Meebo has always provided great functionality without over-featuring the application. This is apparent in their web application, which I'm a huge fan of.
I look at Beehive's screenshots and cringe at the UI. While others might like those features, I'd prefer to keep it simple when it comes to applications that I use on my iPhone.
That said, there may be excellent apps I'm not aware of that fit that criteria...
Exactly why I will wait for Meebo. I cringe at Beejive's UI.
eBuddy is a nice im , simple and easy to use. I'm a user of beejive and i love it but then it somehow feels a little sluggish. Been waiting for meebo and see how they do in this section. Still looking for my perfect IM client.