If you have fast network access, there's now a quick and easy way to have total remote control over your OS X box, including the GUI. A protocol known as VNC (Virtual Network Computing) is the key, and it offers servers and clients for nearly every platform.
There have been a couple of clients for X released (which allow you to connect to other VNC servers), but there hasn't been a server (well, there's one you can run if you install X Windows on X first, but that's a big project in itself!). There is now, however, an OS X VNC server package available which runs native under Aqua, and takes about 30 seconds to get running.
If you look closely at the screenshot (or look at the larger image), you'll see that it's my Aqua desktop being viewed from a Windows98 machine. Over my LAN, this was nearly as fast as working locally on my desktop. To work remotely, though, you'll want a fast internet connection on your X machine.
Getting this working is incredibly simple. Here's how:
Mac OS X Hints
http://hints.macworld.com/article.php?story=20010501085253164