Padraic Brady has posted the first two (and a half) parts of his look at caching in Zend Framework applications - the first looking at general caching and the other, more specifically, at caching in the controller.

• Zend Framework Page Caching: Part 1: Building A Better Page Cache
• Zend Framework Page Caching: Part 2: Controller Based Cache Management
• Zend Framework Page Caching: Part 2b: Controller Based Cache Management

Each entry is jammed full of example code and descriptions taking about things like dependent page caching, static caching, the best places to start and stop the caching, avoiding Zend_Registry and making custom helpers to handle all of the hard caching work for you.