I took a brief look at Zend Framework a few weeks ago, for a project I need to implement for a friend. It is not production ready yet (it even stated that in a few places, one of whcih may have been at the zend framework site itself) so for now I cannot use it.
I've been taking a look at
Symfony and so far am impressed by what I see. But, I haven't done any real development in it yet, and I'm a little concerned about some of the database pieces (using Propel) and how joins will work with lookup tables. When I get some time to actually try it, I'll post my findings.
