I don't care much about security anyway, i've got a hardware firewall. Now lets see whats my latest vista stuff for today ... ah yes.
Two features that I really love. The first is the run/search feature built directly into the start menu... instead of having to click run I can just type in dxdiag there for instance and dxdiag pops up... but wait theres more, I can type in the name of a file like a video and it pops up a list for me, which is awesome (see attached pic one)
Feature two is extremely awesome, I'm a man who loves his folders shown in groups (by type), in XP I can do this but vista adds another thing into the mix. the ability to collapse and select all of one paticular type and that makes it easier for me to organise my files.
Attached Pic two is uncollapsed exe files shown in groups, pic three is collapsed exe files and the rest uncollapsed... handy no?

- All my folders are set up with this configuration.
I am vista's biggest fan, I have no use for XP anymore and next week I plan to delete my xp partition. I don't need it anymore.