HTML Agility Pack is a good and popular toolkit to scrape information from web pages.
This is an agile HTML parser that builds a read/write DOM and supports plain XPATH or XSLT (you actually don't HAVE to understand XPATH nor XSLT to use it, don't worry...). It is a .NET code library that allows you to parse "out of the web" HTML files. The parser is very tolerant with "real world" malformed HTML. The object model is very similar to what proposes System.Xml, but for HTML documents (or streams).
For an introduction to using it have a look at:
http://runtingsproper.blogspot.com/2009/09/htmlagilitypack-article-series.html
If you get stuck at a particular step using it, by all means ask a new, detailed question on Stack Overflow.
