US government has been gunning for poker sites for a while (since 2006 when the UIGEA passed). Some places like Party Poker withdrew from the US market, while others flourished by skirting the rules to the best of their abilities (e.g. can't have ads for internet gambling on TV, so let's make a play money site fulltilt.net that will eventually funnel traffic to our real cash games).
I am however surprised that they're seizing domains as I figured this would remain one of those "live and let live" legislations, like the online gambling equivalent of brown-bagging your drink. I imagine this will not end well for whoever was involved in this decision.
Also, 2+2ers sup bro.