A few updates...
Pulled out the SBlive card and enabled the built-in sound, working fine. So is the Firewire/1394 controller, built-in ethernet, USB, etc. The only "problem" I've had is that when I tried hooking up a CDRW to the SATA controller (via the Abit Serillel adapter) it was quite slow, but worked perfectly. Don't know if the speed problem was the controller or the adapter, but it did work, just decided not to keep it in the system.
BTW, the original poster asked about stability / lockups. I'm running this on a fresh-built box, an Abit NF7-s with a mobile Athlon XP 2500 and 1 GB of PC3200 ram, along with an NVIDIA 5600 Ultra 128 mb. The cpu is currently running at 2.5 GHz (default is 1.8) and is stable as can be even under full load for hours. When I first got this running I was having some lockups which I eventually traced down to a BIOS option for "enchance PCI performance". When this option is enabled and there is heavy hard disk activity the system would freeze. With the option disabled my HD transfer rate goes down very slightly, but the lockups have disappeared.
Yesterday I ripped a DVD and encoded it to Divx, a good test for stability and all went well.
Sarissi - I've used the enterprise kernel, it worked fine. Not sure about the differences but think they're fairly minor.
So far the only odd problem I haven't been able to solve is that sometimes e2fsck will freeze up while checking hard drives, think I've heard of others having the same problem, but haven't figured out the cause yet.