OK, I've tested Spore (Steam version) on Ubuntu 10.04 in Wine 1.2-rc2 with its version of fglrx (probably older than the one I was using on wine) and things look promising (haven't gone further than the menu, but there's no flicker on that) -- except its attempt to connect to the Internet fails. Console output doesn't seem to be putting anything out regarding this failure, and Steam is perfectly able to connect to the Internet. As far as I know, the only real difference from my Arch setup is that I'm now using DHCP (and network-manager) instead of a static IP.
