Per Metsblog, the Mets have acquired Johan Santana from the Twins for Carlos Gomez, Phil Humber, Deolis Guerra and Kevin Mulvey.
More as it develops.
[Update] USA Today has more. The deal hinges on the a contract extension that the Mets must negotiate in the next 72 hours, or Santana can veto the deal.
[UPDATE @ 4:44pm by Eric]: The Twins shot themselves in the foot by not jumping on a Phil Hughes or John Lester deal, and Twins fans are not happy, to say the least. I think it was a pretty good deal for both teams, given the circumstances. Santana had one year left on his contract, and considering that the Yankees may not have even had an offer on the table anymore and the Sox's interest in Santana was tepid at best, the Twins took the best, possibly only, offer they had.
Of course, they could have just hung on to Santana. One year plus two first rounders might have been nice. Either way, assuming the Mets lock Santana up in the next three days, their starting rotation for 2008 and beyond just got a whole lot better.
[UPDATE @ 5:30pm by Eric]: Philly fans aren't happy, so we can be excited about that, too. Whatever comes of Gomez, Guerra, Humber and Mulvey, those results will be revealed on another day. Today, right now, it's really effing exciting to be a Met fan. Arguably the best pitcher in baseball is coming to Queens, and the would-be 2008 Mets are a whole lot better today than they were a day ago. Pending a contract extension, of course.