I just found an invaluable tool for those who use Limited accounts on certain machines.
It's an executable that stores your admin password in a crypt file, so you can "Runas" any program you want in a limited account with admin privaliges automatically.
Normally, you have to type the password each time.
http://www.robotronic.de/runasspc/
If you don't use limited accounts, it's useless!