How popular is an Open Source project ?
There is a really easy way to figure out ...
Look at the size of of the devrooms , if at all , a project gets at Fosdem
It's really interresting to see the Embedded room move to a 500 seat room which it really needed when the first openMoko talk was held there in a previous edition.
The FDO , Drupal, Mozilla, Centos/Fedora and Suse rooms stay in similar size rooms as last year.. But it seems lik the BSD and PostgreSQL room which was pretty crowded moved to a bigger location.
The Ruby room also seems to move to a bigger room. Fosdem has a couple of new rooms too it seems this freed up room for new groups such as the MySQL Crowd
Obviously these sizes aren't a real match to the size of a community, as the new rooms might need (and probably will need) a reshuffle for next year ;)
Different schedules for the devrooms are online .. you'll probably find me in the Debian , Fedora+CentOS, MySQL or Drupal rooms :)
Did I mention that :
and I`ll actually be speaking there again about Monitoring MySQL