Just bought this on Amazon, looks great but I still prefer dead trees for tech books. Awesome that they've released it for free online though, very cool!
Amazon Link (no affiliate): http://www.amazon.com/gp/aw/d/0073523402/ref=mp_s_a_2?pi=SL7...
Amazon Link (no affiliate): http://www.amazon.com/gp/aw/d/0073523402/ref=mp_s_a_2?pi=SL7...
And here's the uk one: http://www.amazon.co.uk/Algorithms-Sanjoy-Dasgupta/dp/007352...