I'll add mine as well. After a lot of trial and error (about 15 reinstalls and two days of labor) I finally have a fully functional install.

AMD Opteron 165 Dual Core
DFI Ultra-D (nForce4 Ultra, ACL97 Audio, nForce LAN, Marvel LAN)
2x1gb G.Skill PC3200
eVGA nVidia Geforce 6800GS (installed Zephyroths universal installer and latest NVinject, added my dev id for it to work)
2x250gb Wester Digital SATA (1x250gb Time Machine backup, 1x250gb Windows XP)
1x120gb Western Digital SATA (Leopard 10.5.2)
1x500gb Western Digital SATA (Files)
Buffalo Wireless NIC (Broadcom chipset)
USB Keyboard & Logitech MX510 Mouse