after all the bashing against some of the 770 bugs I again have something nice to say about it. I finally installed FBReader and a bunch of e, pdfs and html-books. Now I use it as a handy reference manual, search ability is so great (let's quick check which RFC xyz was specified in). It's not perfect yet (perfect does not exist...).
To enjoy your 770 even more you need to be really nice and: don't open multiple websites at the same time (most of the sites just have too much junk and make opera eat your memory), be patient if things seem to hang it will recover faster if you don't try to switch apps, open the menu or change back to normal screen. Disabling flash in opera is also a good idea (I don't like it anyway - sometimes only for games).
Also by now I prefer the 770 over my h6315 for listening to podcasts. The 770 doesn't completely freeze when playing mp3s. It now happened multiple times that it suddenly stopped playing, every time I thought damn it it crashed again. But it didn't I only drained the battery to the ground - I guess thats a good sign :-)