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http://grono.net - a large Polish social networking site. Heavy users of Django (the pre-magic removal branch!), with about 1.5M total users, and 20K online average. Traffic tops at 270Mbit/s. Other technologies used: memcached, postgresql, bazaar VCS. Now hiring.
PDF Invoice generator for Django by Ville Säävuori, Jyrki Pulliainen. Demo is available at http://open.syneus.fi and we'll make full source code available soon.