I've been using the Zend Framework at work for the past two months and I've been playing with it during my free time to work through some of the things I've had problems with at work or didn't understand completely.

I started using it on my OSX laptop with XAMPP and got errors in odd places. I worked out that the version that was in XAMPP was very behind (I haven't updated it in a while so that might be my fault). In order to find this I had to look into how you determine what version of Zend is was using. It turns out that Zend_Version::VERSION contains the current version. I'm going to add this to all of my projects to make it easier to troubleshoot issues.