Ever forget a file on your office computer and have to drive back during rush hour traffic just to retrieve it? I’ve had this happen, though not since I started using a free service to access and control my PC desktop remotely. It’s called LogMeIn and it’s similar to GotoMyPC - except free. The host computer has to be on Windows can be either Windows or Mac but the computer remotely connecting in can be on any computer connected to the Internet - even web-enabled Pocket PC devices. About the only limitation that I’ve found is that it doesn’t support file transfers - which is easy to circumvent by emailing yourself files from the remote computer.
Here’s a description of the service from their web site:

LogMeIn lets you access your Windows PC from anywhere in the world. All you need is a computer connected to the Internet. You see your Target PC’s full desktop and control everything on it—applications, network files, email, printing—without the hassle of further downloads or installations. You can even share files that are too large for email. There’s no need to lug around a laptop, because LogMeIn lets you access your PC from an internet cafe, an airport, or a hotel business center. You can even print documents you’ve accessed remotely.

Link: LogMeIn.com
Link: LogMeIn for Mac (thanks ebert79 for the heads up on this link)