Folding@home is currently working on a number of different molecules, and which one you're helping with depends which project you are currently processing.
you cdan look up the project # to tell you what youre currently working on by that link he gave you. the ps3 will tell you a project # in the corner, systray client you can right click/status/queue info and find the one thats not finished yet. or wait until theyre done and you can from your team stats or personal stats click on the project series o-1000, 1000-2000 etc and itll give you a list of projects youve done, explinations, how many parts of the project youve done