"The sudoWn project can execute individual programs (or even a whole Windows shell) with temporary Administrator privileges under your user profile."
The difference between sudoWn and "Run As..." is that sudoWn launches programs under your account profile - not an Admin account. This means that the launched programs see your Documents & Settings folders, Desktop, Start menu, etc. sudoWn also caches the password so you don't have to keep entering it as you would with Run As...
So, pretty cool tool [and it's GPL]... more info at: http://sudown.mine.nu/