Well thanks to Waybackmachine you can now check the history of your favorite sites. Do you want to know how Google looks like on year 1998? then visit Waybackmachine and type in www.google.com and it will give you google web pages archived from 1996 to a few months ago.
What is the Internet Archive Wayback Machine?
The Internet Archive Wayback Machine is a service that allows people to visit archived versions of Web sites. Visitors to the Wayback Machine can type in a URL, select a date range, and then begin surfing on an archived version of the Web. Imagine surfing circa 1999 and looking at all the Y2K hype, or revisiting an older version of your favorite Web site. The Internet Archive Wayback Machine can make all of this possible.