Two of the secret after-the-credits endings to X-Men Origins: Wolverine have turned up online already. One of them stars Deadpool, aka Wade Wilson. And click through for another one, involving Logan himself.
Update: Videos removed at the request of Fox.
I apologize for the migraine-inducing cameraphone video. Plus the guy who added his own voiceover to the first clip. (Ack!) The first clip involves Deadpool's decapitated body laying in the ruins after the final battle. His sword/arm slides in and out, and then his head comes to life, and says "Shhhh." The "merc with a mouth" now has a mouth once again.
And the second clip shows Logan in Japan, drinking to remember. [Thanks Federico!]