Hey All,
Just installed W7 myself last night. I had XP and forgot to turn on AHCI, but that was my only major hiccup. I also noticed in the bios that if one of my power settings had to be enabled. I think it was ACPI, but I don't remember (it was late at night).
So my system works and I have an X-fi Fatal1ty, which is nice. I also installed Killing Floor, which works fine. It seems a tad slower than it was, but that's okay. I can turn down settings if I need to.
Gotta overclock my machine again as well. Did a bios update while I was installing windows.
Overall I'm very happy with Windows 7. The normal "where is this at?" questions, but it is beautiful in comparison to XP. I think I'll be using W7 for quite awhile to come.
Kind of ironic, but I didn't optimize anything. I like all the aero stuff. First computer I've found it worth having

Welp, have a good one all and let me know if anyone has some "must haves" for W7.
Tony