(I'm going to mention this for completeness rather than because I think you'd actually use it).
There's a product called Timbuktu which is a bit more hard-core than LogMeIn, VNC and Remote Desktop, but really it does something very similar.
It's a paid-for program (and not really that cheap, to be fair) but it does work BRILLIANTLY, it's fast, you can get compatible Windows versions (so Mac-Mac, Mac-Windows, Windows-Windows etc) and it makes a decent job of useful things like file transfers, clipboard syncing and handling different screen resolutions etc.
I've used Timbuktu to remotely control my office Mac from my laptop for a couple of years now and I'm a very happy customer.