What would be the right way to fetch a webpage and parse it?

Apologies if the question is not well-formed. To clarify, I would like
to, when at a page like this:
http://books.google.com/books?id=hyz1HDJ6KxIC&pg=PA242&vq=soliton
be able to get information from the <div class="bookinfo_sectionwrap">
on the page
http://books.google.com/books?id=hyz1HDJ6KxIC
This requires fetching a page and extracting a particular div from it,
and that is what the question is about.

There is a similar example at 
http://diveintogreasemonkey.org/patterns/parse-xml.html
but I was wondering if what's recommended now is different.

Thanks,
Shreevatsa

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