I've had this argument at length with geeky mates.
Bottom line is, I'm not a huge fan of convergence. Every time you merge funtionality, you compromise. You want a tiny phone that you can stick in your pocket, with a huge screen and keyboard for surfing the web and PDA functions. You also want an MP3 player, a camera, maybe a portable video player… Until we start using holographic projection screens, it's physically impossible.
The best multifunction devices in the world, by definition, aren't as good as standalone devices at these functions. The cameras are "ok", but my ten year old IXUS blows them all out of the water. The mp3 players are fine, but really you want hardware buttons to stop / start in your pocket. And now, anyone starting to notice that they're not even much cop as phones any more? I've had smartphones that take several seconds to answer when you try to pick up an incoming call, or go loopy when you try to use a touchscreen dialpad mid-call.
In the case of the Streak, what I'd want in an ideal world is a powerful PDA with the phone funtionality moved to a separate unit. Then I can go to the pub or a concert with my phone without having to lug about a large, very expensive, easy to break / steal device. For day to day usage the PDA side of things can sit in a jacket pocket, to be broken out when needed. Always-on sync using the phone as its Internet connection, because if I've got my PDA then I'll always have a phone. If the phone rings I can answer it without interrupting my spodding, and take notes from the call without having to go "hang on" and try to use some notepad on the phone without risking accidentally cutting them off in the process.
In short, I want a modern-day Psion 5 and the world's smallest phone. They could even be one dockable unit, just split off the phone bit as needed.