This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
I'd suggest you add a getter method to the JavaBean you're using in your collection named something like getLabelForProject(). then have this method return whatever it is you want to be displayed. Then simply spcify label="labelForProject" in your optionsCollection tag.