Playing around these days with Zend Framework I found very useful modules, except controllers, views and so.
People from Zend have made a very good RewriteRoute module.
It allows you to use URIs like http://mydomain.com/section/action/var1/key1/var2/key2, which are very good for SEO (Search Engine Optimizations).
Zend Db and it's submodules are great, too. They present the DB as an object (many table objects), which you can manipulate with their methods (insert, delete, select, update...).
I want to try them for obicham-te.com. Seems that this will make me work against time. We'll see :)