I'd suggest Algorithm Design by Kleinberg and Tardos: http://www.amazon.com/Algorithm-Design-Jon-Kleinberg/dp/0321295358/ref=sr_1_1?ie=UTF8&s=books&qid=12644038

I'd suggest Algorithm Design by Kleinberg and Tardos: http://www.amazon.com/Algorithm-Design-Jon-Kleinberg/dp/0321295358/ref=sr_1_1?ie=UTF8&s=books&qid=1264403861&sr=8-1 http://www.amazon.com/Algorithm-Design-Jon-Kleinberg/dp/0321... , it's more readable than either CLRS or Dasgupta/Papadimitriou/Vazirani.