The latest version of the Zend Framework is version 1.5 — their first major update since going 1.0.
We use the Zend Framework for almost of our applications here, and we recommend it to all php users who want to create applications that will scale well, follow an MVC architecture, and will be maintainable in the long run… So… For all applications that are actually worth anything.
You can get it via http at their site or even via svn:
http://framework.zend.com/svn/framework/tag/release-1.5.0
If you are interested in getting started with the Zend Framework, good resources exist, for example:
And their own online Docs are strong too:

March 18th, 2008 at 4:47 pm
Technically, this would be a minor release since only the 2nd digit has been incremented. But since we incremented it from 1 to 5, you could think of this as somewhere in between.
I’m happy to hear your enjoying ZF and finding it useful!
,Wil