MacMike since your using the Voodoo kernel you need to get a Get a copy of the 10.5.5 seatbelt.kext and install it to replace the one from 10.5.6 you should find it on the DVD.

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OS : Mac OS X Leopard 10.5.6 (9G55) Retail | MoBo : EVGA 132-BL-E758-A1 |
CPU : Intel® Core i7 940 Nehalem 2.93GHz [OC'4GHz] Dual-Display : Viewsonic VX2260WM
Video Card : EVGA GeForce GTS 250 1GB [QE/CI] | RAM : CORSAIR DOMINATOR 12GB [6 x 2GB] DDR3 1600Mhz
Hard Drive : SAMSUNG Spinpoint F1 [4x 1TB] | SAMSUNG Spinpoint F1 [2x 500GB] | DVD Drive : Dual Pioneer DVR-216DBK
WiFi : LINKSYS WMP300N [Wireless-N] | Audio : M-AUDIO Delta 1010LT | Case/PSU : Silverstone TJ07/CORSAIR 1000HX 1000W