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.
[webmasterworld.com...]
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.