We use CloudFlare for everything -- CDN, DDoS mitigation, Railgun (see below), et cetera. They serve ~1.5 petabytes of bandwidth on our behalf every month and proxy billions upon billions of requests. I'm a huge fan of the product and team, despite hiccups like this one.
More on Railgun: http://arstechnica.com/information-technology/2013/02/cloudf...
Edit -- I am officially faster than carrier pigeon:
me: was i the first human to notify you guys? | me: i caught it within the first 30-60 seconds i think | me: because i have no life and never sleep | CloudFlare Ops pal: yeah. you did.
If anyone wants to hire me to check their site instead of Pingdom, feel free to ping me!