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Gaming . . . are you joining as in an online group and will return for team play or just to access the games? Are there benefits beyond just accessing the games? If no to both, seems like that would eliminate join; if yes . . . ? Join might be appropriate if there are immediate benefits to "joining" that you display. Join infers a group participation.
Register may seem committal, "Now I'm registered with this organization." Create Account sounds appropriate IMO . . . but as I said, I'm on the fence on this one and all ears. :-)
What are other similar sites using?
Checks this site . . . there it is, "register" . . .
[edited by: rocknbil at 3:32 pm (utc) on April 6, 2009]