At my Bike Commuter's Meetup, we've started a new monthy feature where we turn one person's morning commute into a group ride for whoever else wants to come along. It's nice not to be alone for once, and over time will give us all a taste of other commutes.
I just led our first one this morning, on my commute, and had two other guys join me. Interestingly, they were both riding fixies, while I had my good-weather 21-speed, but I kept looking back and seeing them keeping up just fine! (And I thought I was in such good shape...! )
I mention it because I think it's a cool community-building idea that others might want to try.