A quick note - if you need to connect to a Windows system (nt, xp, server, 2000, vista) via RDP, you may be a bit out of luck. The Microsoft remote desktop client for Mac is not universal and may not run on some more modern OSX systems. One alternative is to install TSClientX, a terminal services client for OSX. This is a nice app, but running under Darwine can be a pain sometimes when you need a quick connection. Try grabbing a copy of CoRD instead - http://cord.sourceforge.net/ - a free, fast, and seemingly stable RDP client. Nice options to speed things up and a good user interface, this app makes connecting to a remote desktop as easy as using Cyberduck.