Failure works good, but it is the difference between frequennt and infrequent training which is why I recommend leaving a rep or two in the tank.
http://www.mindandmuscle.net/content/page-238.html Lifting to fail? With ref
http://www.drsquat.com/index.cfm?act...e&articleID=20 Dr Fred Hatfield
http://www.muscletalk.co.uk/article-...ertraining.asp CNS fatigue from failure training
http://www.strengthcats.com/CPworkingtofailure.htm Poliquin, training to failure
http://www.charliefrancis.com/index....=25&Itemi d=2 article about HIT vs reg training in sports
http://www.cbass.com/KevinDye.htm Hit advocate stops training to failure
http://www.bodybuilding.com/fun/sisco2.htm Pete Sisko, training to failure not necessary. Including why the last rep is not nec the most productive
http://www.timinvermont.com/fitness/failure.htm Training to failure not necessary
http://bodybuilding.com/fun/wade2.htm Natural BB talks about why failure training is not necessary
http://www.myodynamics.com/articles/failure.html failure training not nec including refs.
http://www.redwhiteandbluefitness.co...ShowPage/31534 article about CNS with refs
http://staff.washington.edu/griffin/failure.txt Killer article by Lyle McDonald re: training to failure
http://www.deepsquatter.com/strength/archives/ls12.htm Louie Simmons
http://www.drdarden.com/readTopic.do?id=394848 failure training owned on HIT site no less