I just did a fresh install of WoW from the CD's using the 11/29/2006 nightly build and all went beautifully. I created a WinXP bottle and installed WoW using the built in script. No need to copy dll's or install IE.
The updater failed, but was easily restarted. All of my Add-ons work correctly (including discord & insomniax), and I get slightly lower fps than my native XP install does.
WoW appears much more responsive with CXO than under XP... even with the slightly lower fps :)
Full screen worked great, even with translucencies running in X (haven't tried Beryl/Compiz/Xgl yet).