From Facebook Developer Wiki

There are now more than 3 types of flavors.

E.g. just hit the "WallAttachmentEditFBMLFlavor".

Pete, if you can add this page to your queue of pages to review at some point in the future that'd be cool. --543396022 14:32, 20 June 2008 (PDT)

It appears there is another flavor, Tab. At least that's what the error messaging i have been getting suggests. Perhaps this entry needs another review?