Is there a complete conversation convergence app? I was very impressed when I saw the first demo of WebOS quite a while back. I loved the way they integrated SMS, email, and social media all into one stream. Their point was that the most useful view was one oriented around the people, not the media. I think that's a very good point.

I've heard that FriendStream on HTC is pretty good but I have a samsung device. 

I'm a big fan of Tweetdeck which brings together four (currently) social networks. You can post to all four at the same time, for those soap box moments :-) 

I'd like to see an app that brings together EVERYTHING! even the voicemail and call log! 

Am I asking the impossible?
Many have tried.  It's arguable whether anyone succeeded yet or not.

The big ones are Motorola's MotoBLUR, HTC's SenseUI, Samsung's TouchWiz - they all try to bring together the disconnected social aspects of different applications such as e-mail, text messages, and various social networks.  Each does it differently, with varying degrees of success.  Unfortunately these aren't stand-alone products.  They usually come pre-installed with their respective manufacturers' devices, and overhaul more than just social aspects.

There are also 3rd-party apps and widgets that attempt to do this merge.  One of the best that I've used is SlideScreen. I didn't like the fact that it replaces your launcher, but it sounds like exactly what you're looking for.