When you run a lot of Drupal sites it can be annoying to keep track of all of the modules contained in a platform and ensure all of them are up to date.
A Capital Region Drupal meetup (the first of its kind I believe) is scheduled for March 6th and I hope to be able to talk about authentication and identity.
Back in May of 2008, I did a survey of 1,370 Drupal sites, and came up with some interesting version statistics. At the time, Drupal 6 had been out for about 3 months, and the adoption rate was still fairly low.