That's useful - but there's a couple other easy ways to do this as well.
With the web developer toolbar for firefox you can disable scripting and CSS (which still leaves images loaded, but is a similar output).
Also, if you search for a page in Google you can click the arrow next to the listing, then click "Cached", then click "Text-only version" (
http://webcache.googleusercontent.com/s ... ns&strip=1 )
This gives you a text view of what Google actually has cached for a page.