You have 48 hours to put your name down to participate in the Guild Wars 2 beta which takes in March. The sign ups date cut-off is February 24th.
If you are confused about the beta, you can read this comprehensive FAQ posted by AreaNet, the developer of Guild Wars 2.
You can go here at their official website to participate. Guild Wars 2 is an MMO which promises to revolutionize the genre.
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