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Next, I'd check the header response that those URLs are sending (If you're a firefox user, the Live http headers extension is the best I've found for checking). If they are returning a code 200 that could cause a lot of trouble for you. (The search engines will see them as different pages with the content of your index... major duplicate content.)
If they are returning a 200 OK, I'd 301 (permanent redirect) all unused query strings either to the index or try to get a 410 (gone) response on them. There's code in the apache forum here that will help with that.
[edited by: LunaC at 1:26 pm (utc) on Aug. 8, 2006]