My 2 cents:
Like flshlite said.....lift the keg every once in a while.
Here is a trick that works with propane tanks (might work with kegs too). Pour a some hot water down the side of the keg. A noticeable hot/cold line can be felt with your hand to indicate how much is left.
Regarding what happens when your keg runs out of beer (quite often at the worst possible time)....i keep a few cans of beer tucked in the kegerator to be used for just such a crisis.
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