Remote Desktop for Mac OS X

I am trying to use Remote Desktop to connect to my PowerBook from work. How can I connect to my PowerBook running Mac OS X remotely from Windows XP?
Microsoft makes a Remote Desktop client for Mac OS X which allows you to connect from Mac OS X to Windows XP, Windows 2000 Server or Windows 2003 server. Unfortunately, this software is client only, meaning it doesn’t provide a host connection for Windows XP to connect to your Mac. The Mac Remote Desktop client software is free, so it’s not without advantages. Apple sells Apple Remote Desktop for small businesses and enterprise installations wanting to connect between Mac machines, which uses free third-party software to connect to Windows XP. Apple charges $299 for 10 client connections or $499 for an unlimited client solution. Fortunately, the best solution for connecting between Mac and Windows bypasses Apple’s solution altogether as freeware.