For anyone who hasn't updated to this yet, quite frankly I wouldn't bother, I upgraded 2 systems from 10.5.5 to 10.5.6 on my own (ga-p35-ds3l) I had to go back to kexts from 10.5.5 for bluetooth and usb, bluetooth just didn't work and usb was a little glitchy at times, on the other system (foxconn intel 945 chipset) I had to replace kexts for bluetooth and nvidia kexts for 7300le card as new kexts broke sleep.

For both systems I can honestly say the advantages of upgrading were zero, personally if I had known would have waited for the next update to fix this update which has been pretty shoddy compared to previous updates. Just my opinion, what's yours?