Andi Gutmans has good news for anyone out thre that has wanted to get involved with the Zend Framework on a more official level - they're looking to grow the core team:

Zend Framework has become an immensely successful project. [...] There's a large community of contributors, over 15 translations of the documentation and runs some cool apps like IBM's QedWiki. We are currently looking to grow the team with very experienced Senior Web developers, both from within and outside the PHP community.

Those interested should look forward to working in a "broad, vibrant and passionate community". Check out the full job description for more information.