You might check out this thread:
http://forum.bonsaitalk.com/showthread.php?t=7766
and there are some others that come up in "related threads" at the bottom of the page. It really depends on your current skill level. Bonsai Techniques One is a great primer. Vol II is more about putting those techniques into practice and drawing inspiration from natural trees.
Regards,
Matt
P.S. the "Articles" section is for articles about bonsai.