Ones no one mentioned:
Tim Hightower RB ARI - Edge is old and not worth his paycheck. He's the only RB with a chance to take over long term. Might start getting red zone this year.
Chris Taylor RB HOU - 3rd Houston RB mentioned in this thread (Houston is the new Denver?). Really he's the only one with a chance to be a feature back. Could be a nice compliment to Slaton if it all works out. In that situation, he'd get most of the TDs and would probably be the one you want to own.
Mike Hart RB IND - Probably assumes the Dom Rhodes role in a year or so. Looked great against 3rd stringers in the HOF game
Jacoby Jones WR HOU - Late bloomer, still learning the game. If he matures, there's a big void in an improving offense.
Robert Meachem WR NO - Not a bust yet. If you look at the Devery/Patten/others stats from last year, there's a lot of points to be had for a #2 WR in NO.