I remember billy had that discussion a few weeks ago about his deads so I thought this might be useful. Its a pretty good article with examples.

http://www.t-nation.com/article/most_recent/5_common_technique_mistakes

crossfit.com is a good site aswell.

Good timing, just after some advice on my lifts too ... here's how I do them :-

http://www.oasisonflinders.com.au/pic01.jpg