The subject of Point of View often comes up on WW. Below is a link to a good, clear, straight-talking, introduction to the subject by Rob Sawyer. You can find it at Podcast No. 4. (Actually, No. 3 is very interesting, too - on how to submit to editors.)
http://www.sff.net/odyssey/podcasts.html
Terry
<Added>And the other two are very good - Jeff Vandermeer is an excellent writing teacher.