This year's Kanellakis prize goes to Robert Schapire and Yoav Freund for their work on boosting. They had previously won the Gödel Prize in 2003 for their paper "A Decision Theoretic Generalization of On-Line Learning and an Application to Boosting".
Jennifer Rexford has won the Grace Murray Hopper Award.
With a mixture of pride and regret I point out that all three are AT&T Labs alumni.
If you want to know more about what these awards are given for, visit the ACM Awards page. The Kanellakis prize commemorates an achievement that spans theory and practice (has theoretical heft and has shown to be effective in practice). The Gödel Prize acknowledges a single journal paper that has had great impact in the last seven years. The Grace Murry Hopper Award is a 'young achiever' award, given to researchers below the age of 35. The Turing Award, of course, is the computer science "Nobel" for lifetime achievement. The Knuth prize is the theory lifetime achievement award.
Gödel, Turing and Knuth need no introduction. Paris Kanellakis was a professor at Brown who died tragically in a plane crash in 1995. He was one of the pioneers in database theory. Grace Murray Hopper was one of the first programmers of modern computers, the first compiler designer, and is attributed with the coining of the term 'bug' to describe an error in a program.