Funny, I posted in this thread, and just this morning a friend came by to show me his new Archos 9.
I had already played with one a little bit, so I already knew I didn't like it, but I wanted to test something. We went onto the Toyota website, because he's shopping for a new Prius when he goes back to the US. The site runs Flash for the main intro to the car, it got about 3 seconds into the Flash video and the whole Archos locked up, couldn't do anything, we had to take out the battery and put it back in. We restarted, went back to the site, this time it got about 6 seconds into it, and locked up again.
Yeah, this thing is EXACTLY what iPad should be!!
HAHAHAHAHAHAHA!
Seems to me that is exactly what the iPad will give. iTunes is basically there by default as it's a music/movie player. Email, yep it'll do that. There will at least be iWorks and most likely a port of OfficeMobile for Productivity tools (who knows what other groups will jump in there). I thought the iPhone/iPod could connect to Exchange servers. I have an iPod Touch (so same interface as yours) and I see the iPad as almost spot on what I wanted from the iPod, which is almost what you seem to want... minus the IMing.
I'm not sure what else you want from the device. I can understand wanting to run an IM client in the background, so wait until iPhoneOS 3.2 or perhaps 4 allows developers to run a stuff in the background.
Aside from a software update to open a bit of backgroud/multi-tasking the only thing missing is a stand that 30 degree keyboardish angle. Personally I would want a bulit in stand... just an extra part that'll be a pain to replace if it breaks.
A full OS like Windows 7 is to much for a 'slate' or pad device. At that point I would want full laptop specs underneath that touch surface... which would mean taking something like the MacPro along anyways. If the iPad (iPhoneOS) isn't to your liking on this kind of device I'd keep an eye on the Google backed venture into this product line.