Last year for the Riders of Rohan Beta Turbine had a whole bunch of twitter trivia for Beta invites, certain websites were given a bunch of codes to give out and then of course they also give out invites to new people too. If you didn't get an invite in the initial wave, there's no doubt going to be many, many chances to get one.
Just keep an eye on the grape-vine, basically.
[LEFT][COLOR=#ffffff]Morlenil Barkolomew Turmuz Shurz Gruubluk
Posting in white; so people can read my dismal ramblings easier.[/COLOR][/LEFT]