I rank them pretty much like this:
1. Reggie Brown - Had an up-and-down campaing last year as he was hurt by the presence of Donté Stallworth. He showed great promise last year and he will be the clear #1 WR this year, although Kevin Curtis will probably receive his fair share of looks (as Brian Westbrooke will)
2. Braylon Edwards - Superstar material. If he can stay healthy, he could produce huge numbers. The only problem I see here is the QB question in Cleveland. I have doubts in Frye's abilities, but Quinn will be great in a year from now.
3. Mark Clayton - Great potential. But size will limit his possibilities, especially since he seems the have the part of a possession receiver.
4. Vincent Jackson - Good receiver. His main problem is that, even if he is the #1 WR, he will remain the #3 target in this offense behind Tomlinson and Gates. But the emergence of Rivers and the fact that the Chargers shown willingness to throw the football late in the season open some interesting possibilities.
5. Matt Jones - Pivotal year for both him and Byron Leftwich. Both have to show they deserve their status as starters for this team. He's a brilliant kid with incredible abilities. I think he will make huge strides in his developpement this season.
6. Brandon Jones - #1 option on this offense. Had only 27 catches in a full season last year. I also fear that Vince Young will develop into a younger version of Michael Vick
7. Troy Williamson - Drops. That was the story for the last two years. I read somewhere he some vision problems and that he corrected them... Robert Ferguson used that excuse last year and he didn't improve much! Anyway, I doubt the Vikes' QB (s) will help him much this year.
8. Devery Henderson - He's been very inconsistent, although he showed some flashes. His main problems are the developpement of Colston and the fact that Reggie Bush will probably see an increase in his work load. And let's not forget the fact the Saints drafted WR Robert Meachem in the 1st round...
9. Nate Washington - Great potential, but he's the #3 WR in Pittsburgh (although there has been rumors of 4 WR sets in the steel city...). Good TD threat.
10. Roddy White - Great talent... But his QB is Michael Vick (for the moment

)
11. Chris Henry - Probably the best pure talent on this list... But he spends more time facing the law than he does opposing defenses.
12. Mike Williams - Has a long way to go to prove he deserves a spot on an NFL roster...