If you are a sysadmin - you must know about this tool..

As you can see, you create a file - add 'configurations' to machines, and then it allows you to connect to many RDP machines at the same time, it auto-scales the desktop to whatever screen size is available, and let's you change between them with ease.

Great app!

(download an old version without limitations here: http://drpcfix.com/links-and-files/10-royaltsinstaller.html)