If you want to try Google Android then no need to buy a T-Mobile GI. Live Android gives you the facility to download a live CD disc image of the Google Android operating system and run it on your X68 computer. Just you have to do that burn that image to a disc, put it in your CD drive and reboot your PC. Now you will be able to run Google Android without installation.
You can use it with virtualization application as VirtualBox or Microsoft Virtual PC without rebooting your system.