Had some creaks and pings that turned out to be a loose spoke. Other times had similar noises that turned out to be the rear wheel skewer being just barely loose enough to shift in the dropout under heavy load (standing pedal mashing).

Recently started getting some creaks and squeaks on my road bike commuter, and of course I assume it to be either pedals or BB. Nope, it was one of the wheel skewers again. I put on some new tires last week and made sure to get those skewers tight, and haven't heard any noises since then.