doh, i didn't notice your link =)
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PcProphet,
I started plowing through PHP Deserializer (Perl script that parses Gallery's data files) and mapping out the structure. [Tring to figure out the structure by greping the gallery files just took me way to long.] Needless to say, i have not finished the map.
Hope this helps get you off to a good start.
Take care,
Foobonic.