Lots of ways to consume and manipulate feeds and BI about the feeds. For example, Scoble reqs everyone should take a periodic core sample of the blogosphere for phrases such as "<my product here> sucks" and examine the results. To do this, see:

www.pubsub.com

http://digg.com/

http://www.feedster.com/

http://tech.memeorandum.com

http://www.technorati.com

http://icerocket.com/

http://blogsearch.google.com/

http://uckan.info/depot/monitorthis/