I'm riding year round so far, but obviously in terms of group rides things won't heat up until the weather improves. I'm looking forward to the Five Boro Bike Tour, the Bike MS ride, Escape From New York, and a few others on the NY/NJ calendar.
Speaking of which...someone ought to make a calendar of all the major bike rides in a given area, particularly for large metro areas. Between the various charities and whatnot, there's probably several each month during the spring, summer, and fall -- at least in NYC, and probably in most other places as well. I wonder if there's anything like that out there.