Official Google Blog: Beyond Instant results: Instant Previews

With an overview of your search result....that highlights the most relevant sections, you will find... that just right page as quickly and easily as flipping through the pages of a magazine. Just click once on the magnifying glass next to the title of any search result....
and a visual overview of the page will appear on the right.
Then just, hover your cursor over any other result to see....
your preview.

Internet Archive: Wayback Machine

Internet Archive: Wayback Machine
Want to see that site when it first started out?
Use the Wayback Machine and take a peek at
how it used to look......way back when.

Browse through over 150 billion web pages archived from 1996......
to a few months ago.
To start surfing the Wayback....
type in the web address of a site or page where you would like to start....
and press enter. Then select from the archived dates available.
The resulting pages point to other archived pages at as close to the date.....
as possible.