I do wireless support for MailStreet. We do exchange hosting and provide blackberry enterprise server, goodlink, and activesync for mostly small businesses. (We're pretty damn good too, and I'm the best fucking wireless support technician on the planet (or so I make myself believe).)

I support all of the handhelds that can support microsoft exchange in some form or fashion. I've seen just about all of them these last 5 years.

The iPhone is a beautiful device. It's great for movies, music, email, pictures, and is perfect for a 'Mac person'. I like everything about it except for the keyboard. I'm not a huge fan of touch screen keyboards. You can't drive and type on it at the same time (not that that is ever safe to do with any phone). If it had a slide-out, true keyboard, it would be the dominant device. There is also only one model of iPhone. There are no other options or models. Supporting it is a little tougher, especially when you are trying to talk a novice thru entering settings to get it configured for an exchange server. Half the time they fat-finger the settings and end up deleting and redoing the same settings a few times before they get it right. Also, battery life stinks.

The blackberry is a true business machine. I carry the 8900 curve from t-mobile and it is very stable. I also use it as an MP3 player. I don't bother with movies on it because who wants to watch a movie on a 2-inch screen? Coupled with the blackberry enterprise server, you sync email with subfolders, calendar, contacts with subfolders, notes, and tasks (notes and tasks do NOT sync on the iPhone. Microsoft still has Apple by the balls). The camera is solid and does video as well. Getting a blackberry to activate on an enterprise server can be tricky, but once it's done, it's a fairly powerful PDA. (I've mastered this activation process.) I've played with the Storm (touch-screen BB) and it's nice, but not for me. I've used the curve, pearl, 8220 flip-pearl, 8700, 7100, and 6210. All were stable, solid devices in their time.

The windows mobile phones are ok, but tend to reset and drop calls too frequently for my tastes. My engineers like to use them because of the slingbox app and the ability to RDP into servers remotely. It's also microsoft, so the apps included are already familiar and non-intimidating like some phones. Activesync is super easy to setup and support. They sync tasks unlike the iPhone. Still no notes though, which I must say is weird considering the blackberry does it.

The Google G1 is pretty neat and has a future if Google keeps putting money into it. Just kinda young right now.

Palm lost a lot of market share and is scratching and clawing to survive. The centro, pre, and palm pro haven't impressed me too much. The people using them are usually holdovers from the original palm pilot days. Kinda like how Mac people keep buying Macs. Why use a stylus when everyone else is using a finger-touch screen? Seems a little antiquated to me.

This is all leading up to the point where you'll plug your phone into some kind of docking station that'll connect a keyboard, mouse, and larger screen to your phone to run standard business or non-business applications. The desktop computer, almost disposable now, is going to slowly disappear. Our phones will take their place and be far more important.