Use the Way Back Machine to See Older Versions of Websites
Have you ever needed or wanted to look at a previous version of a website? This is easily done on the Way Back Machine (archive.org)
It allows you to browse through 
over 150 billion web pages archived from 1996 to a few months ago. Just type in the web address of a site or page and hit enter. (Unfortunately, keyword searching is not currently supported.) You will see a listing of dates that archives for that page or site are available for. Click on a link and you are surfing in the past. And the resulting pages point to other archived pages at as close a date as possible.
Looking at really old websites puts some perspective on how far we have come. There is an early version of the website I build for my old firm from December of 1996. Hmmm… fond memories of coding HTML in NotePad. At least I had hair in my bio picture way back then. 🙂
And this site has been used in court in a trade mark dispute to show the time of actual use of a mark. Questions of admissibilty of the site were resolved in favour of admission. ITV Technologies v WIC Television (2003)
I noticed this tip just after I posted this website comparison using the Internet Archive: http://www.slaw.ca/2012/11/19/national-magazine-has-a-new-website/
It’s a great tool!