Keith Law of espn.com released his top 100 prospects list.  I was happy to see Vitters at #14.  Law says this of Vitters,

"Vitters started the year slow due to a hand injury, ended up returning to short-season ball, and hit everything in sight. He has an easy, smooth, quick swing that would be that classic "sweet" left-hander's swing if it wasn't for the fact that he hits right-handed. He doesn't have great loft in his swing, but is strong and makes extremely hard contact; he led the Northwest League in doubles at age 19 and as he fills out a little bit, some of those will go over (or through) the wall. He's fringe-average at third base; he has plenty of arm and his footwork is improving, although he's not likely to ever be plus over there. If there's a concern, it's the very low walk total; he's not a hacker or even impatient, but is very aggressive, and that works as long as he's ahead of the pitchers and can make so much solid contact. If his patience doesn't improve and he doesn't continue to hit .320-plus, his ceiling will start to drop. If the patience comes, he's a potential No. 3 hitter who'll hit plenty of doubles and 25-plus home runs with a high average."

Some interesting guys that Law rates Vitters ahead of:  Maybin, LaPorta, and Dexter Fowler.  If Vitters pans out I wouldn't mind seeing him hit frozen ropes all over wrigley :)