Wordpress gallery output in V 2.5

Example of gallery output from a default Wordpress gallery. Please see the galleries bug page for more information.

: Caption - Joe Bloggs

: Caption for second image

Issues I'm trying to improve on:

Valid, minimal HTML output. (Not including style information by default, using lists properly etc.)
Mapping from the interface to the output (i.e. where titles, alts and descriptions are shown.)