Say it isn't so, David Letterman! Brett Fav-re??

Just a reminder - QB Brett Favre of the Green Bay Packers (you can't make me say "formerly" or "retired") will appear on Letterman's show tonight. Last time Brett was on the show was in 1997 after the Packers won Super Bowl 31. Favre is in New York, in part, for an event in Central Park called NFL Play 60, a program to get kids off the couch and involved in sports at least 60 minutes a day.