SniperRyan - 10:09 pm on Dec 12, 2005 (gmt 0) Please correct me if I'm wrong.
I believe the PHPBB exploit that NoLimits mentioned looked for a specific file using the allinurl search parameter. I believe most PHPBB installations have now kept this certain file from being indexed and therefore easily accessed by the worm. Thus, an inurl search for specific keywords (possibly w/ a php extension?) might trigger Google to think twice about letting you see results.
Please correct me if I'm wrong.