If you regularly use an automated/scripted migration tool based on Salesforce.com metadata API (like their ANT tool), this is a pretty handy piece of documentation just to see what you cannot do with metadata tools:
Unsupported Metadata Types
I also want to add to the list that, even technically considered a page layout, the Case Close page layouts are not available. If you try to retrieve them the way like regular page layouts, you get nowhere.
The list also has the same error with the criteriaBasedRules.