Sega's blog posted two codes for a free copy of the Xbox Live version of Phantasy Star II. These are on a first come, first serve basis and will work only for the first person to enter them. If you've got an Xbox Live account (I don't, so I don't know if these still work), try 'em quick!
The Phantasy Star II codes are:
RC9FQ-CT8HQ-TKQRK-642BH-BH2XT
WYFVG-D2CQV-BJJ4W-V3QBQ-T9TKW
There are also codes for other games. You can find those in the blog post.