How can I further diagnose my central air conditioning compressor fan motor and capacitor?
I ended up pulling the capacitor and testing it with my ohm meter.  It was dead.  I could have easily gone to the local HVAC supply, purchased a new capacitor for $30 and installed it myself.  But, because I also wanted to have the pressure tested, I called in the guy who installed my furnace.  He affirmed that I "did good", it was the capacitor.  And because I had done most of the diagnostic work, he cut me a good deal.  

In the end, the most important bit, on a 95 degree day when the humidity is 70%, a happy wife is a blissful life.  ;)