Jeff,
Noted. Are you looking for the nearest Cloud Base/Ceiling altitude or nearest airspace ceiling/floor? I suspect you are speaking of cloud ceiling, but I could see the potential for both. This would also make a great layer to be shown like how we have Fuel Prices, etc. Maybe as a subset of a Metat/Taf settings?
FYI, we are working on some awesome "internet" Weather features that will add interactive Prog charts, sigmets, satellite visibility, etc.
I'll add Nearest Ceilings to the wishlist for further discussion and consideration. Nice feedback and have a great weekend.