few different low resistance measuring circuits
http://members.tripod.com/~baec/DEC90/ohmmeter.htm
http://www.tpub.com/neets/book3/7l.htm
with a nonelectric VOM
http://www.tpub.com/neets/book16/69.htm
uses four-wire measurement technique
http://www.angelfire.com/electronic/funwithtubes/low_res_meter.html
converts the change in resistance of a potentiometer into a digital value without using an expensive A/D converter
http://www.edn.com/archives/1997/050897/10di_04.htm
http://www.rfdesign.com/articles/1999/19990101.pdf
suitable for measuring audio circuits
http://www.jensen-transformers.com/as/as048.pdf
A simple resistance measurement circuit which shows if resistance is smaller or higher than the threshold set to circuit. The output is using two LEDs
http://www.kolumbus.fi/mikko.esala/johtavuusilm.pdf