I think this is an important question to bring up. From all accounts, Jay Bruce was originally to replace Ken Griffey Jr. in right field after the 2008 season. I have no doubt the Reds will buy out his option year in 2009. We have now seen a trade of Josh Hamilton, who was our starting center fielder. Dunn may be re-signed, and Bruce may take Hamilton's spot, but that still leaves right field to be sorted out after 2008.
Norris Hopper and Ryan Freel are good reserve outfielders, but neither can be counted on to start in the outfield. Freel is too fragile, and Hopper does not take enough walks to be a legitimate lead-off hitter. Dickerson is a good defensive outfielder, but he is not a good hitter. Stubbs and Dorn are possibilities for the future, but right now neither is close to the major leagues.
You can attempt to find a right fielder in free agency, but the market for outfielders seems really inflated. In the end, it may very well be that the Reds have no choice but to pick up Griffey's option and sign him to an extension, unless there is another starting outfielder possibility I have missed.