In a new post to his blog, Jim Plush talks about why he made the choice to go with the Zend Framework over other framework options for his company (Panasonic).

At Panasonic like most large companies we have a plethora of websites ranging from little one off reporting sites to full scale applications. A major problem arises when these sites are left up to the discretion of the developers to choose their own styles, languages and frameworks(mostly custom to themselves). [...] This was where we were 7 months ago. During that time I've been developing a Zend Framework based application that will house all these sub-apps as "modules" underneath the main Zend umbrella.

He lists the reasons why he chose Zend's framework offering - it has the strength of a company behind it, its flexible, its proved its stability, the small footprint and the copious amount of documentation that's been worked up. He also points out a few things that can help keep his development (and, really, anyone's) on the "straight and narrow" - code reviews, a code inspector and unit testing.