Hmm, nice step: the Zend Framework will be included in the repositories for Ubuntu Hardy Heron, scheduled for release in April. Not that the average developer wouldn't be able to obtain a copy of ZF otherwise, but it's nice that it will be included.
Let's hope updates to the Zend Framework will be ported rapidly into Ubuntu, so Ubuntu/ZF users wille be able to truly depend on the packaging system.
So far Stephan has been very timely in checking in ZF updates- 1.0.4 is already there! In the short term, we'll be working with him to include 1.5 ASAP.