iPad is just as overrated as the iPhone. Pretty worthless.
I do have a B&N Nook Color that I rooted into an Android tablet - it's nice for showing photos on quickly. But it is a ton cheaper, and I got it for $50 off list price, and I use it mostly for e-book reading anyway so the photos are just an added bonus.
I think all the other tablets that are larger are overpriced.
I'm actually typing this on a rooted Nook Color (running Cyanogenmod 7 instead of the original Nook software). I didn't want to spend an arm and a leg on a tablet that I knew I wouldn't really get much out of, since they are mainly media consumption devices. There is very little on terms of productivity you can do on a tablet, that wouldn't be a lot easier/faster on a notebook. That being said, its nice for showing off photos (the smugmug app is great if you have a smug galleries), reading books in color, email, web surfing, etc. Not a necessity, but fun to goof around with. One neat thing on the nook, is that it has a microSD slot. I've taken jpgs with my camera (in a SD to microSD adapter) and phone, then popped them into the nook for viewing, emailing, etc. You need to be a bit of a nerd to go the nook route, but the general idea is the same.


