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Not all of the variables are used in the current site, but they're linked out there from other sites so I don't know if I can really ignore them or not.
Thanks for any advice you can give :)
Pick one URL for each page, put that in your sitemap and then modify how Apache handles things (using mod_rewrite) so if the user agent is a known search engine spider the other URLs get permanently redirected to the one authoritative URL you've chosen for the page. Regular users can use whatever URLs they want of course...