You can now sign up for FINAL FANTASY XI Public Beta test @ Square Enix (thanks VE3D). The goal of this Public Beta process is to test connectivity to the PlayOnline network as well as give a few lucky players a sneak peek at the FINAL FANTASY XI and the PlayOnline network. To be considered for participation in the Public Beta test program, you must completely fill out and submit the online application form on their website!

Note: "The Public Beta Test Is Open Only To Legal U.S. And CANADIAN Residents"