Tom, I had part ownership of a J24 in Little Harbor, I think it's still moored there because the waiting list is at least 8-9 years for a mooring! It's a dark blue hull and the name (was) Blue Max. It's still owned by one of the original partners, Mark Robinson, of Portsmouth. He's always looking for crew if you are interested in the spring. I think they race Thursday nights and Saturdays, there is a Laser fleet that races on Sunday too.

There is a Cape Cod Frosty fleet http://www.capecodfrosty.org that frostbites in the back chanel of Newcastle. See if you can track down Pete Follansbee (phonebook?) and he can hook you up with a loaner boat.

Have you found a good beach to use for launching a cat yet? There are a lot of rocks out there so be careful! There is a guy from Rye, now in Newmarket (I think), named Craig Hackett (if he's still there) who races a Nacra 6.0 and a 5.5. If you can find him he can give you some good locations for launching.