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Thats a very nice URL hack you have, i would definatley be interested in using this once you are happy to release the code, I also notice that you dont have /modules/ that is very cool.
Im not sure how search engines react to the long urls but alot of blogs like b2evolution use similar url's which contain the post title doesnt seem to do any harm.
I curently use the news titles hack by herve and its improved my news pages rankings I think your url hack would comliment this perfectly.
Michael Jackson = King Of Pop
Xoops = King Of CMS