I was thinking about the Harmonie Hundred myself. Bike Chick, you have been on this ride, how hilly IS it? I've looked at the maps and it doesn't look like it is very hilly.
This ride takes place over two days, so there are two 50 mile routes, one for Sat and one for Sunday. Registration is only $15 and there is information here. The dates are April 30th and May 1. There is mixed information on this site just yet, some pages reference the 2011 dates and others reference 2010 dates. It does NOT look like there is a mass start as there is a 2 hour window to start - and I find that quite attractive.
How would those dates work for everyone?