This just in from TVGuide.com:

At times during the past three months, we never thought we'd say it, but ... the WGA strike is officially over. According to the WGA websites, members voted by 92.5 percent to lift the strike order that was enacted November 5.

Following WGA leadership's approval of a tentative deal on Sunday, the guild members on Tuesday voted to lift the strike order, which has been in effect (and playing serious havoc with our TV viewing) for three months. Members on both coasts voted in person or by proxy, and the "polls" closed just an hour ago, at 6 pm/PT. Yes, the vote to end the strike was expected, given the positive feedback after meetings on the deal over the weekend, but still, it feels so good. The writers will be revving up their typing fingers and plot points to get back to work on Wednesday.

Grey's Anatomy is expected to return with four to seven new episodes to air in April & May. How its timeslot will be affected, however, (due to Lost) has yet to be determined.