TopDesk: Expose for XP
Windows XP users can now have one more feature Macs have had for a long time - Expose! Otaku Software's TopDesk lets you use hot keys, mouse hotspots or floating desktop buttons to view and sort all of your open application windows, easily navigating to the one you are searching for. TopDesk sells for 10 USD but may very well be worth it with support for multiple monitors and customization for everything. Take a look at the videos here, they are quite impressive. You can add TopDesk as one of the steps to turning your PC into a Mac.