Well, the only way you can really be over-googled is if you're either:
A. Experiencing page load time problems on your site
B. You're having problems with exceeding your monthly bandwidth.
Otherwise, the more the merrier! Tek, your home page on your site is actually a PR6 right now, so I would assume google never leaves your site. At a PR4 (which is what my index.php page is) Google is supposed to spider your site once every 24 hours approximately. Well if you have several thousand (or hundreds of thousands) of pages, it will take google more than 24 hours to scan your site, thus it will essentially never leave.
Google never leaves my site. You can easily tell that from my google logs from this mod on my forum.
Remember if google visits your site a lot like me and tekguru, it would be a good idea to clear those logs at least once a week. as of right now the .script does not do it by itself already.
Zac