Tobias Schlitt has posted an announcement about the release of a Call for Papers for this year's "Free and Open Source Conference" (FrosCon):

The PHP Usergroup Dortmund is proud to announce the call for papers for this years PHP room at the "Free and OpenSource Conference". The conference, which is organized purely by open source enthusiasts on a voluntary basis, will take place from 2007-08-25 and 26. Location of the FrOSCon will again be the University of St. Augustin (near Bonn), Germany.

This Call for Papers is just for the PHP room at the conference which will be held for two days this year. Check out the official site for more information.