Tina Fey and Steve Carell are tentatively set to co-star in Mail-Order Groom -- a comedy about a desperate woman who orders a husband from Eastern Europe --which will be co-produced by their respective companies, Little Stranger and Carousel Productions.  Fey and Carell will first be seen together in Shawn Levy's Date Night, which hits theaters on April 9, 2010.  According to The Hollywood Reporter, the concept for Mail-Order Groom comes from Fey's husband Jeff Richmond, and the script is currently going through rewrites by Glenn Ficarra and John Requathe  (Bad Santa and I Love You Phillip Morris).

Fey and Carell are two of the funniest people in television today, so I think the more they do together the better, but don't be surprised if either or both names get dropped from the project.  They both have successful shows on NBC, and their schedules are backed up due to Date Night publicity, so it may be tough to find the time.  However, even if they choose not to star, presumably they'll stay on in a producing capacity.