There’s a lot of clever ways in which the Aegir community was advancing their project, like DevShop, a develop/test/deploy system, and integrating WordPress (!) with it; it's a really vibrant group. Aegir 3 has just dropped, which is really exciting for us. While the system has worked relatively well over all Aegir had its share of bugs and glitches that make things challenging for us, and the move to Drupal 7 is a big leap.
Just hanging out with these interesting people was fun, and I love the synergies that come out of it. I finally got to meet in person Guillaume Boudrias with Praxis Labs, who does a lot of Aegir support for NDI, and Mathieu Lutfy, the head of translations for CiviCRM; we've been collaborating lately on Arabic and Ukranian work. It was at a Civi Code Sprint in CA two years ago I first met Christopher Gervais and we schemed up the seed of an idea that evolved into the DemTools project. Can't wait to see what comes out of this year's interactions!