I upgraded to Edgy over the weekend. Not nearly as painless as yours I’m afraid. I was running Compiz-Quinn AIGLX and really should have known enough to remove it prior to upgrading. Anyway, I ended up having to modify a line in my gdm.conf-custom file. It took quite a bit of fiddling to even find that out. Not as smooth an upgrade as I would have liked (I’m a newbie but a persistent one. Most others would have given up on it much earlier I’m afraid). That said, Edgy is running quite nicely now – markedly more slick than Dapper too.