Installed SL 10.6.3(iBoot CD + MultiBeast 3.1), here is the result:
Dell Latitude E5500
CPU: Core2Duo P8400 2,26GHz
MEM: QPI 2x2GB 667MHz DDR2
VGA: Intel GMA945 - Works in 1280*768 (but not in 1280*800, but still better than default 1024*768)
LAN: Broadcom BCM5756 (not working, couldn't find driver)
WIFI: Broadcom BCM4322
FIREWIRE: Ricoh R5C832
AUDIO: IDT 92HD (plays sound but hardware volume controls aren't working (OSD works, but doesn't reduce/increase volume))
MISC: touchpad/joystick & keyboard is working after installing VooDooPS2 drivers with MultiBeast. VGA is semi-working (1280*768) if you extract your DSDT and use that instead of EasyBeast.
I hope it helps, later i will try to read up on DSDT-s and find out maybe i can make hardware controls working for soundcard or something.
Also i tryed to install Ableton Live 8.2, installed fine, tho had problem with integrated sound card, couldn't recognize it, but with my FireWire audiointerface (Focusrie Saffire) it did work perfectly.