I'm going to wait to hear how others manage before upgrading to 7.
Beaumont
My son has done a clean install and works a lot faster for his gaming,
i have upgraded my laptop (from vista) and again has improved speeds,
easy to do as it does various compatibility checks and any programmes that have issues it will tell you first, i only had one and that was power dvd that was installed from day 1 and i never use, i know 3-4 people that have upgraded or done a clean install and no problems at all,
timewise upgrade took longer to do than a clean install (2-3 hours) but again very straight forward, so don't upgrade at a time when you want to get back to doing something quickly, once you have agreed to checks etc,
you can then leave it to do it's thing for a couple of hours.
After install on the upgrade i checked all loaded programmes and all seem to work ok, have 4 computers on a network and they all resumed working as normal.
Websites i had in my favs' all still there and didn't require user/passwords, so didn't delete cookies, no major changes to confuse you to much,
so to recap, (in MY opinion) Windows 7 is deffo faster/slicker, easy to upgrade (my upgrade was done from vista) and all in all was a positve