Allow the definition of arbitary parameters in XML and pass them through to the singletons
Allow config.xml to define a singleton/method that can alter the select query before it's executed.
Feeds can define an "after_item_filter" which has full access to the feed item after the field mapping is performend.  This can be used to remove the item from the feed, or replicate it multiple times (e.g. configurable children).
Renamed variables to improve readability
Fixed file extensions
Implemented XML support vis XMLWriter class
Add support for uploading generated feeds via FTP
Remove debug code