Raggie,
You did not say exactly what your gas bill was (and only approximated your electric bill)...
Several things... For your stove, if it any where near modern, it should not have any pilot lights. For our furnace, if you are not using it, you can turn off the pilot light (call the gas company if you decide to turn it back on later and need help). Third, watch your gas meter and make sure that it is spinning only when your major gas appliances are actually on (water heater, stove, furnace). Make sure that it only spins very slowly--or not at all when your appliances are turned off (each pilot light seems to be able to use $2-$5 of gas per month).
Same thing with your electricity--make sure that the meter only spins when you are, knowingly, consuming power. (Didn't you earlier change to CFL on your common area lights that are powered from your meter???).
It is possible that either accidentally, or on purpose, somebody is sharing your power connections (I believe that you live in an attached condo).
I know that you try and live pretty frugally--I would hate to see you struggling because you were paying for somebody else's power. I pretty sure I suggested the same thing earlier--so these suggestions may not apply.
-Bill