[dsraven]

-check your alternator as well. lots of times the alternator is the cause. pull cable off the alt and install volt meter between the output stud and the cable. should read zero.
-check the stereo because they can also be the culprit. had that problem last year with my boat. drained battery overnight. they will have a parasitic load if they have a clock or memory.
-pull "hot with key on" wire off ign switch and check for a draw. not unheard of to have a faulty ign switch feeding circuits
-check wiring harnesses for mechanical damage. especially around hot things like exhaust.
-check the back side of the fuse panel for anything that looks odd. I had one that had a poor connection at one of the crimps and it melted the panel a bit over time so the panel distorted and allowed some cross feeding of circuits that meant a parasitic load with key off.
-if you have a trailer hitch plug check that as well. plenty of those have caused problems before
-check starter connections and/or disconnect the battery cable to check for a draw through the solenoid internally
-disconnect battery ground
-connect voltmeter between battery and ground cable
no load would mean zero volts. obviously that won't be the case since you already know you have a parasitic draw
-pull fuses, one at a time, while watching the volt meter. an old fashioned analog meter works best for this because it won't "auto range" or keep scrolling through numbers when the voltage changes by a decimal point.
-when you pull a fuse and the voltmeter reading changes then that indicates a draw in that circuit
hopefully you find it. post up the cause when you do.