Rescue Terrible HTML with TagSoup
http://www-128.ibm.com/developerworks/xml/library/x-tiptagsoup.html

Ogbuji, Uche
IBM
2006

Abstract:

XHTML is a friendly enough format for parsing and screen-scraping, but the Web still has a lot of messy HTML out there. In this tip Uche Ogbuji demonstrates the use of TagSoup to turn just about any HTML into neat XHTML.