The second is my favorite of the two.
I know this is like a few weeks late but if you havent watched season 6 yet, this is a pretty funny summary of the first 5 seasons, performed by an extended Italian-American family.
YouTube- "Lost" Recapped by Extended Italian Family
Here's another funny video from over a year ago where you get to see what's it like for one guy who's never seen the show to catch up on 4 seasons of LOST in two nights.
YouTube- Previously On Lost
I lol'ed at both of em. Have to say my favorite part was in the first one when the Cheesus (Brett Favre) was on TV. In the alter-verse I'm in, the Vikings won the Super Bowl.