GistWeb will give the gist of any web page's actual content. It's goal is to provide a "summary" version of any page, giving you the meat and discarding the fluff. This saves loads of time when doing research online.
 
To use GistWeb, drag this -> Gist It! <- link to your bookmarks toolbar (Mozilla/FireFox Users). If you're using Internet Explorer, simply right-click the link and select 'Add to Favorites'.
 
Any time you want the gist of whatever page you're on, just click the bookmark! GistWeb also works with html files you have saved on your local hard drive. Just open the html file (File->Open) and click your GistWeb bookmark.

One last note: As a rule, GistWeb only works well on English documents. Using it on documents of any other language may produce low quality results.