Todd's Favorite Mac Apps: CoRD
CoRD lets me connect to multiple servers simultaneously while only taking up one window of screen real estate, or I can use windowed mode so that each connection has a dedicated window.
Adding a connection is as simple as providing a label, the server IP address or hostname, and any credentials that should be saved for easy access:
When connected, I can easily use the Windows machine as if I was sitting in front of it:
CoRD combined with Apple Remote Desktop and a VPN client allow me to remotely control Windows or Mac machines from almost anywhere. CoRD supports connections to Windows 2000, 2003, XP Pro, and Vista, but not VNC or Apple Remote Desktop clients.