For awhile, the sites I requested Google to block in my search results were not being blocked. When I finally looked it up using Google, there appears to be some confusion out there. To set the record straight, if you use the Manage Blocked Sites, you must also select "Use personal results" under the Search Settings (that little gear button in the top right hand corner of a search results page). The combination of specifying blocked sites and using personal results somehow enables the sites to actually be blocked on searches. Hooray. Here's my list. Stupid patent sites.