Registration is now open for WABA's 2009 Vasa ride:
http://www.waba.org/events/vasaride.php
The ride is free, but they ask folks to register in advance so they can make sure they have enough blueberry soup on hand after the ride.
Ride lengths of 56, 28 and 14 miles. Starting at the House of Sweden in Washington, DC (Georgetown).
I was going to do this a couple of years ago, but it was too cold and windy so I wimped out. But if we have good weather this year, I think I will do the 28-mile route.

