The Internet Archive has refined its Wayback Machine interface and released a new Beta version. The Wayback Machine is an archive of web pages. You enter a URL, and the Wayback Machine shows you how that page looked on different dates. I tried the Beta version and really love the interface - very easy to use and it's a breeze to click between different dates to see a page's evolution. The classic Wayback Machine interface is still available if the Beta version is down.