My ankles both pop and crack pretty much all day long, doc says if it doesn't hurt dont worry about it. Another doc told me that if you exercise a lot and your joint tighten up, they may misalign a little bit when you are resting and when you move from the desk or chair or whatever, your joints will pull themselves back into place creating that popping noise.

try going barefoot an hour or two per day. that really helps my feet and ankles get all the bones aligned, which seems to be the source of my "popping". at least your coworkers know you're coming! see you at the RNR half...