Thissite documents their hi-tech products. The amount of information the USDA collects is phenomenal. To get a glimpse of some of the information they have check out this site. If you like numbers, you'll go nuts here. This site currently boasts over 3650 articles on mad cows diseaseand related topics.
Some articles are clearly reputable, some are lessso.
If you're at all curious about BSE you can't do better on the internet. If you're going to be in Ontario in September be sure to check out this event. Around 1000 exhibits are expected and 150,000 attendees. This site is an interesting departure from normal market information sites. It uses an advanced java and javascript interface tosource both internal and external web pages to bring you averitable plethora of market related information.