http://www.mmorpg.com/giveaways.cfm/offer/424/Defiance-Beta-Key-Giveaway.html
dunno if its been posted and i know its a bit late but the last beta weekend starts today and u can get ur beta keys there..there is still about 4k keys left so...ill be checking it out...this is all for the pc..i think ps3 started there beta weekend on the 20th i believe and ends sunday?...xbox will start today and will end on the 27th..pc starts today and ends sunday