Wayback Machine
I can guarantee that this is going to keep you busy for a while. Since 1996, archive.org have been taking snapshots of the web and archiving them for use via their Wayback Machine.
A quick search for chimpomatic brings up our 2001 'coming soon' page which ran for a good couple of years if I remember correctly.
Gizmodo had the article that got me started and they go on to reference this MSU page, which has a pretty good round-up from the likes of Apple, Google and McDonalds.
30th Jan 2008 - Tumblr