This software has transformed my life and the lives of those that work for me. Download Logmein here.

So, from any machine with an internet browser I can access my machine at home. Cool... In practice I go to logmein, sign into my account and then select the machine that I want access to. I think you can have as many as you want. You need to install a plug-in but it only takes a minute or so. They also offer some backup solutions etc but I haven't tried them yet.