Detonate:
Also, here is a good article on using Snatch Blocks properly. I read a post here where some one mistakenly thought that snatch blocks added effort/force to the winch point. The opposite is true, thus the whole reason for using one or more snatch blocks to lessen force or change direction when winching.
Australian off-road site:
http://geocities.com/RainForest/3648/4wd_winching.htm