If you are Cogent or Level 3 customer, you may be experiencing some problems with your surfing experience today.  It seems that the two have decided to play the "I am better than you game" at the expense of their customers.
According to the information Hardware Geeks  - this is preventing web pages on one site from being accessed by the others ones customers. 

http://www.hardwaregeeks.com/comments.php?shownews=3713

http://status.cogentco.com/

http://news.google.com/news?q=cogent+level&scoring=d

It looks like these "boys" need a timeout.  Go to opposite corners and take a deep breath. (Isn't that what we tell the children when they start fighting.)

It will definitely be interesting to watch this one play out.