Did you know Vista has a take ownership command right in the box?
I used to have to do this with a command called "Chown" which I had to download seperately. Now, "takeown.exe" is right there for me.
Also, my favorite unix command of all time (whoami) also ships in the box. With whoami /all you can figure out what groups you're in and what privileges you've got. What's neat is that because Vista has "split token" SIDs, you won't actually see all your Privileges -- even if you log in with Domain Administrator credentials. You only get to USE those privs when you elevate thru UAC (User Account Control.)