Commercial Text Summarization Tools
There are a couple of open source options I know of - 

LibOTS - http://libots.sourceforge.net/

DocSum - http://docsum.sourceforge.net/docsum/web/about.php

A couple of commercial solutions - 

Intellix Summarizer Pro - http://summarizer.intellexer.com/order_summarizer_pro.php

Copernic Summarizer - http://www.copernic.com/en/products/summarizer/

And this one is a web service - 

TextTeaser - http://www.textteaser.com/

I'm sure there are plenty of others out there.  I have used Copernic a good deal and it's pretty good, but I was hoping it could be automated easily, which it can't - at least it couldn't when I used it.