Poodle78, welcome to the forum!

I don't have a 770 so I can't really help with the three questions, but I'm sure someone will sooner or later.

One thing I would say though, is that the 770 is a very old gadget now (it was launched almost three years ago in 2005) so it's really not showing the tablets at their best. The N800 and N810 are far better in terms of hardware and software, and they're easier to use as well.