We use real VNC on several systems and a secure shell alternative called Zebedee for our people who desire a more secure system.
VNC is easy to set up and use, and is mostly used by our female office staff who work partly at home, and they have no problems with it at all. Currently it is used on win98 and win2k systems, and best of all, its free as well.
It is easier to use when dialing to an office setup though, where the network is always on, but some people have logged into home machines from work, without problems as well.
cheers