Comments: find
2 - find('threaded')
The find type 'threaded' doesn't actually seem to be supported as of 1.2 RC2. A different method called findAllThreaded() is though. Needless to say this requires the model to be a Tree of some sort.
3 - order direction
To specify the order direction (i.e. ASC ou DESC), just add it into the 'order' param.
For example:
$this->Post->find('all', array('order' => 'Post.created DESC'))
There is no proper parameter to do that.
4 - Order Associated
By the looks of it you cant order associated data.

By primeminister on 20/8/08
1 - Adding remark to find('count')
When using find('count') you don't use the 'fields' array in the options, otherwise it won;t return anything or null.