John Hollinger writes for ESPN and has a statistical tool for evaluating potential college players who are coming out in the draft called the Draft Rater. This is in addition to the statistical work he does with existing NBA players to evaluate based on their Player Efficiency Rating.
I recall last year that he had Kevin Love rated very highly (as well as Mayo ranked down somewhat). There are many examples of how this tool identified players who should have been drafted higher. You can get some interesting info on his tool and opinions by reading today's chat on ESPN - Hollinger Chat
His work is part of ESPN Insider but I found another NBA Blog (The Knicks Blog) that posted a good story about the Draft Rater and listed the top 12 players in Hollinger's tool for the upcoming draft. They are -
Top 12 Player According to Hollinger’s Device:
1. Ty Lawson, 2. Blake Griffin, 3. Ty Evans, 4. Austin Daye, 5. Steph Curry, 6. Nick Calathes, 7. Dejuan Blair, 8. Danny Green, 9. Flynn, 10. James Harden, 11. Hasheem Thabeet, 12. Earl Clark
I found it interesting that Lawson was #1 and that he's not on anyone's radar for the top 10.
Should be worth a little debate on those rated higher than current mock's and those who are projected lower (10/11) or missing altogether (Derozen/Holiday).