I also successfully upgraded from 10.6.4 to 10.6.5 w/o modifying anything on my current configuration:

DELL LATITUDE D830 running SL 10.6.5 with following kexts:

• AppleACPIBatteryManager.kext
• AppleACPIPS2Nub.kext
• AppleBCM5751Ethernet.kext
• ApplePS2Controller.kext
• fakesmc.kext
• NullCPUPowerManagement.kext
• OSXRestart.kext
• SleepEnabler.kext (10.6.3 version)
• VoodooHDA.kext (removed AppleHDA.kext)

modified com.apple.Boot.plist by adding:

<key>GraphicsEnabler</key>
<string>Yes</string>

DELL 1390 WiFi module

which enabled:

• Battery management (Battery status in menu bar is fully operational)
• USB (mouse, external keyboard, headset,...)
• Built in Ethernet
• Trackpad
• Sleep mode
• Sound (both Output AND Input for built in speakers/mic AND external Logitech USB Headset, even the volume up/down and mute buttons are fully operational!)
• 1920x1080x32 on external and 1680x1050x32 on the internal display. Both mirrored as extended desktop work flawlessly. Only the VGA port works (HDMI does not)
• WiFi

Not working (yet):

• Shut Down / Restart