Well, alot of top starting pitchers have had dreadful starts and could probably be gotten for far less than their normal value. A short list of top pitchers who have had shaky starts would be Schilling, Pedro, RJ, Zito, Mulder, Hudson, Halladay, Miller, Oswalt and Maddux. Some owners, especially inexperienced owners may be pushing the panic buttons on these guys. Some prominent batters who have had slow starts include Berkman, Konerko, C. Jones, Abreu and Dunn. Also, you might be able to get a bargain on injured studs like Giles, Jeter and Beltran, who all should be back in a month. Avoid Griffey though.
Players with inflated values right now might be Austin Kearns, MacDougal, Runelvys Hernandez, J.T. Snow, Mayne, Matheny, Reggie Sanders, Blalock, Crawford, Baldelli, Bernie Williams. Not saying that all of those will tank but that their fast starts increases their value over where it will likely be in a month or two.