WayBack Machine: Archived versions of websites

A friend of mine recently shared this great find. A website that archives versions of websites way back to the beginning of when sites were first published. It's called WayBack Machine and is available here (http://www.archive.org/web/web.php) Try it out and you'll find yourself spending more time that you intended. I was able to look back and find websites I did 9 years ago. I could see many uses for this besides just for nostalgia. You could use it to reference the website history of a new client, so you know what not to do and where they've been.