I thought I'd add to this as I recently had a creak\click coming from my bike when I pedaled. I thought it emanated from the crankset/BB and occurred once per crank revolution. I tried pedaling one-footed with left/right and it was still there. Oiled my chain, removed the crank and basically tried almost everything. Finally, when I changed my rear derailleur hangar, the noise was gone. I had a fall perhaps a year ago, and had the hangar straightened by my LBS, but I think it must have bent back on its own since. Perhaps I should've just bought a new one then and saved myself the hours of noise hunting!