Do a search for [site:www.google.com "www.google.com/pda"] on Google.

http://www.google.com/search?q=+site:www.google.com+%22www.google.com/pda%22

Hmm, why do they index all that? In the robots.txt of Google.com I can see...
Disallow: /pda?

It sure adds noise to the SERPs...