If Apple's Magic Trackpad appeals to you but you're a Windows user, you can still take advantage of the multitouch device on your Windows machine by using abstracted Boot Camp drivers.
Apple made its Magic Trackpad compatible with Windows, but only if you're running Windows under their dual-booting tool, Boot Camp. Tech blog Digital Inspiration provides step-by-step instructions for grabbing the Apple Magic Trackpad patch for Boot Camp, extracting the files you need and installing them on your Windows machine. This method will provide you with the full gesture support you'd get with the Magic Trackpad on a Mac, but on your Windows machine. Check out the full guide at Digital Inspiration.
How to Use Apple Magic Trackpad with your Windows PC [Digital Inspiration]