Recently I wrote two blog entries that might be of interest to you. The first one is a call for people to help with the booth at LinuxTag Berlin: http://szabgab.com/blog/2010/04/1271829580.html
In the second one I added some numbers I apparently missed from previous reports in FOSDEM and CeBIT http://szabgab.com/blog/2010/04/1272008292.html In short my estimate is that on FOSDEM we talked to 3-400 people while on CeBIT we talked to about 1,000 people. On LinuxTag I expect about 6-800 visitors to our booth. Compare that to the number of people on the regular Perl events such as the GPW with 130 visitors or YAPC::EU with 300 visitors. regards Gabor