This one'll be tough. I have a meeting at MIT at 11 a.m., and I have a strong feeling (gee, I don't know why) that it won't be done before 12. If, by some miracle, it is, then I'll come. If I'm not there at 12:05, roll out.
I'd say that 1:30 would for sure work. However, I might have yet another obligation that day, so let me get back to you later today/tonight. Oh, and I just got my SLR saddle...gotta test that out.
By the way, the ride yesterday was awesome. We did a touch more than 40 miles, and the off-road section was sweet. Nothing like running through a set of sandy whoops (at least half a mile of them!) on slick road tires at speed. Got a little loose there, but man, that was fun.
jrowe - yeah it looks like noon will work out after all. My meeting got moved later to the evening. For route suggestions, you might want to check out what we did for the ~40 mile ride that we did on Thursday. We figured out a sweet way to get between Lexington and Bedford without using the bike path, that also tacks on some extra miles. If you want, I can sketch it out in (Google) Pedometer.