Python

Genshi

Offers HTML which is a fairly good html parser. It is parsed into a genshi stream which offers basic xpath searching but not traversal of the tree

lxml

Offers good HTML parsing into a DOM tree. based on libxml2 so is pretty robust

BeautifulSoup

Also handels HTML.

!ovTagSpan

My own. Based more on regex than anything.

Genshi

from urllib2 import urlopen
from genshi import HTML

page = urlopen('http://finance.yahoo.com/q/pr?s=JAVA').read()
gs = HTML(page)
print gs.select('//td[@class="yfnc_modtitlew2"]/b/text()') 

Javascript

Uses Firefox to do the dom parsing.

Solvent

Solvent Based on Piggybank from Simile

Crowbar

Crowbar uses the screen scrapers generted by Solvent in a command line or as a web service.