Aegir
I was thinking about what I could might be able to offer as a talk at the upcoming BADCamp. It got me thinking about my current Drupal portfolio which currently includes:
Aegir
I wanted to upgrade the aegir tools on the -dev and -prod sites. I ran into some problems running the upgrade steps; which are probably due to some mistake I had made in managing the changes made since the original install. During the upgrade process, I was getting a variety of database error messages. I'm assuming that part of the problem was that I had originally installed 0.2, then upgraded to 0.3 and somewhere along the line, upgraded drush. Another symptom I was seeing was that my crontab for aegir was gone, so I could not process tasks.
Ran into a problem with a migration. Found this thread useful: http://drupal.org/node/511690
Ended up getting a successful drush connection using, drush -u 1 cron, drush -u 1 updatedb, etc. The site is owned by raknight, so my usual credentials didn't work.
I've been following the developments at Development Seed regarding their work in Open Atrium. Development Seed has also been working on another project entitled Aegir. From the project page: "Aegir is a set of Drupal modules that help you maintain your Drupal sites."