To give some more anecdote facts, I also upgraded to Kubuntu 8.10.
All went ok, no problems whatsoever. All hardware detected all right. Even the compiz 3D effects where working all right (except for some "noise" just after opening new windows and before the window background is filled).
Very nice visual, cools icons, but... I hate KDE4...
Please! Don't release beta software as fully complete!!!
To redeem myself, instead of "downgrading" back to my 8.04 32-bit Kubuntu, I decided to finally try the 8.04.1 64-bit Kubuntu, so I can still say I made an upgrade to my system :-)
On the other hand, everything seems to be working on 64-bits as well, after the usual fight with the sound card volume controls.