The PDF "cheatsheet" linked to from here seems to have a few more too:

http://searchengineland.com/070703-090122.php

I get quite different query parameters. For example, I just searched for [foo] from the Firefox search box, and got these:

   http://www.google.com/search
   ?q=foo
   &start=0
   &ie=utf-8
   &oe=utf-8
   &client=firefox-a
   &rls=org.mozilla:en-US:official

...not one of which is listed in the blog post. In particular, I've always had "q" for the query string, and not "as_q".

Thanks for the list.
Basically I only use "q", "hl" and "gl"..