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don't forget that if you are on *nix server, you may be able to use mod_rewrite to convert dynamic URLs to static URLs.
plenty more threads in the forum where that came from.
i've just gone back to check altavista and most have dropped out with the recent update (last week?). i don't know if this is a respidering problem or a change of policy or something, but the altavista update seems to have screwed up a lot of listings on a lot of my domains. i'm not too worried as i wasnt getting much traffic from there anyway.