That depends on the specifics. Are you talking about one particular page on one particular site? Several pages? Several sites? Is the layout of the page(s) predictable? Are there ID tags on which you can rely?
You will need to do some coding, but the libraries I mentioned will help you get started.
Joined: Feb 21, 2009
You can also use biterscripting (.com for free download) for parsing html. It works great.