Problem:You have an super user login and a regular user login and you want to be able to explore the network as your Admin ID while logged into the PC as your User Id. Or you need to explore a users' system as the local Administrator without having to log the user off the system. You used to be able to Run Internet Explorer with a Run As switch to do this, but after upgrading to Internet Explorer 7 that no longer works.
Solution:Use the program C:\windows\ie7\iexplore.exe. Browse your hard drive to the folder C:\windows\ie7\ and find the program iexplore.exe. (This is a hidden folder, so if you can't see it make sure you can see hidden folders under Folder Options) Now right-click on that program and pick "Run As." Click "the following user" radio button and then use your Domain\User ID or else the Computername\Administrator, depending on who you need to log in as, and the password associated.
This will spawn a new instance of Internet Explorer with the credentials you specified. Nifty!