Two interesting rowing boats have been launched, reported at Duckworks. The first is a Flint design by Ross Lillistone, built by Bruce Erney who rows on the Cooper River in New Jersey. She's a very attractive boat, 14ft 7in by 4ft, and Bruce says he is having to learn how to row fast to keep up with her.
Daniel built Esperanza for his parents (nice pictures here) who seem to be enjoying rowing her very much. The design is Jim Michalak's RB42, 18ft by 3ft 9in. I would consider installing outriggers. Do follow the links to the design, by the way - it has some dramatic pics of Herb McLeod's boat in the Rocky Mountains.