Log in as admin to see another account.

Log in as admin to see another account.

It would be great as an administrator to be able to be able to log in to a CRM user's account without them having to give me their password every time. I occasionally run into problems where it would be helpful to log in as the user and see what they are seeing to troubleshoot the problem.  I know Sales Force gives users the ability to temporarily grant the administrator access to their account.  Any thoughts on this?