I received my Nokia N770 yesterday. The screen is really nice, and the character recognition is really impressive. Currently my major problem is the wifi connexion, it's really unstable but I don't know if the problem is on the tablet side or on my laptop.
Next step : get root !
Update : got root ! The flasher utility did not see my device, but I finally got it by bringing it off/on several times before and after runing the flasher utility. The device is now in R&D mode, so I can use sudo /usr/sbin/gainroot and use stuff like usbnet. I now can really play with my toy :)