Chris and Jana submitted some work that included a prologue. I jumped on them a bit. (Of course you can be sure that my next submission will include a prologue.) But I did some research and found the following link which talks about prologues.
http://www.writing-world.com/fiction/prologue.shtml
This article describes four reasons for a prologue which are: "future protagonist", "past protagonist", different POV, and background.
I also found the folowing which I found interesting:
An agents home page:
http://www.nelsonagency.com/contactus.html
A blog from a F&SF editor:
http://www.tuginternet.com/jja/journal/
A list of the top ten writing and publishing blogs:
http://www.associatedcontent.com/article/52495/top_ten_blogs_about_writ…
And two writers home pages:
http://www.dansimmons.com/index.html
http://www.tarakharper.com/home.htm
So quit writing and waste time on the internet. What kind of writer are you?