Probably going to be a winner for me. Pauline has an iPad (3) which I find a bit too large to lug around. I actually bought a Playbook a few weeks back, and while the size was right, the software on it was just so painful to use I returned it a week later.
It was actually more convenient to just use my previous generation iPod Touch on a recent short trip (the alternatives being the Playbook or dragging along a long-in-the-tooth laptop). Worked out better than I thought it was going to.
No longer trips planned for a while, but I think a 7" iPad (and a Bluetooth keyboard to pull out for any longer email sessions) might be just the ticket for future travel.