Alright, eff it!
Installed Windows 7 Pro x64 RTM
Everything except the Wifi was detected and installed instantly. Vista driver installed fine and works perfectly.
All the apps I've installed so far, firefox, iTunes, Tweetdeck, Winrar, Divx all seem to work fine.
Performance is pretty much on par if a little behind XP with Explorer.exe but I think thats mainly down to the small amount of time taken for the fancy pants transitions and stuff.
iTunes certainly seems a bit faster (x64 version although I dont think its 64bit)
Firefox 3.5 is much the same. UI is a bit meh in Aero but maybe they'll tweek it for 3.7 which allows the tab peeking on the taskbar (Considering downloading the pre-alpha version)
Tweetdeck is fine, pops up with more advanced notifications in Aero. The one issue it has it when its minimised to the toolbar bit, the taskbar then shows it as not having a window open, which technically it doesnt, but it bugs me coz it looks then like it isnt running haha.
I think I like the Windows Backup feature. I'm gonna set backups of my Photo and Downloads drive so it does this automatically every day and also once im done getting everything sorted on the OS drive i'll create an image of the OS so if I ever have to restore its easy!
Its growing on me. 8 Years of XP isn't gonna go out my brain overnight, and considering I totally skipped Vista I've got a slightly higher learning curve.

Canon EOS 5DmkII + BG-E6 + Canon EOS 40D + BG-E2N + Canon EOS 33
Canon 17-40
F/4L USM + Canon 24-70
F/2.8L USM + Canon 28mm F/1.8 USM + Canon 70-200
F/2.8L USM IS + Canon 85mm F/1.8 USM
Canon Speedlite 580EX II + Canon Speedlite 540EZ + 2 x Nikon SB-80DX
Cactus V2s Wireless Trigger -
5 x Cactus V2s Wireless Reciever
MY FLICKR!