I picked up my fiance's original passport when I visited him in the UK, and plan to return it to him in person after I've applied for the visa. (I'm applying in person.)
I've heard so many different message board stories about what you need -- the original, a copy, a certified copy, a notarized copy, the picture page, all the pages--that I think it would be best to contact the Consulate directly.
The best way, I think, would be what I am doing, but I realize that might not be very practical for you.