This is a collection of pointers to other Web sites on the subject of personal minimums in the operation of aircraft and, more specifically, in instrument flight.
DISCLAIMER: I haven't even read all the information on these sites, let alone determined if it's useful, It just exists, maybe it'll be useful for you.
FAA Aviation Safety Program - http://www.faa.gov/avr/news/pmcp/pavepmcp.htm
AOPA Article including a discussion on personal minimums - http://www.aopa.org/pilot/features/mos9711.html
Results of study on personal minimums - http://www.cami.jccbi.gov/AAM-400A/Abstracts/1998/FULL%20TEXT/9806.pdf
Results of an AvWeb poll - http://www.avweb.com/qotw/qotwform.cgi?0120
AOPA article on gradual IFR immersion - http://www.aopa.org/pilot/features/ii_9812.html