I vote for Zend Framework too - and i would say its better than any other php framework including Symphony. Im not expert on server administration but i have big experience in php developement and i've introduced few projects based on ZF. Another thing that is a plus in case of ZF is that Zend the actuall company behind PHP is supervising the quality of code. Also ZF is faster than Symphony (proven by benchmarks), some big companies like IBM use it.
ZF is BSD licensed so you can freely use it in a GPL project.
"You are getting fast results and you have a very good documentation. Please take a look into the new php Magazin .-). A CMS in less 1 hour."
I can say the same about ZF, but when you compare the classes and possibilities, symfony in its current state is behind already im affraid. And ZF has great docs. Please we are talking about really serious and complex app that needs to work flawlessly, not "1 hour cms", that is not a valid argument imho. Symfony and ZF are probably the best of them all, but i can prove ZF is better, and its not tightly coupled so its a plus.
As a resident on #zftalk i could with some luck convince and bring few more experienced webdevelpers to the project, of course i can help with developement and contribute some code too, altho im rather busy changing my new job to something better.
http://framework.zend.com/
If you guys want to use a Ajax framework, maybe YUI (Yahoo User Library) would be a good choice? Its BSD too, has INSANELY GOOD docs, its quality of widgets is unmatched imho - its fast , has a lot less bugs than dojotoolkit (i know - ive used both), can be served from CDN. ANd it has some widgets that could be very handy for an app like a control panel, like data tables, and tables in YUI are ones of the best of all, jsut compare the docs and examples. THis framework powers YAHOO and is enterprise level.
http://developer.yahoo.com/yui