Every industry needs a watchdog, someone who keeps a close eye on things. The hosting industry is fortunate to have Data Center Knowledge doing just that. The articles are well written and straight forward.
If you've ever wanted to know what really happened to cause the Amazon Cloud to dry up or how a car crash was able to take down Rackspace or why the Planet (now Softlayer) caught fire then you'll want to put Data Center Knowledge on your must read list of Web sites.