I like the atmel/fun. L53 file set from
www.laurals.com
they seem to have a new kind of flash. ( V4.xx_Flash File )
That I think is faster and that file Fileset is less confussing for the beginner because you only get the flash
and the external.EEprom
But if you like Xamuh file set you can still mix and match, ie the Xamuh-ext.EEprom and the L53 Flash. From one beginner to another I hope this helps.
P.S I hope I did not break any rules.