Geocities was a popular service back then that allowed its users to create basic websites. Many Geocities pages dated back to the beginning days of the Internet where webmasters liked to use animated gifs, sounds and other distracting elements on their pages.
The Geocities-izer brings back those fond memories by offering to turn any modern website into a Geocities look-a-like that is making use of all those elements that were popular back then.
It works by entering the url of a website into the form on the main page of the service.

Three different themes and twelve different music themes are available that can be switched by changing the parameters directly in the url. The themes are also switched randomly whenever a new page is loaded.

Users who want to go down memory lane can visit the Geocities-izer tool to turn their websites into something completely different. But beware, it might hurt your eyes and ears. (via Instant Fundas)
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Hey, J’ai testé sur quelques sites, je trouve que ça abuse des gif inutiles et placés aléatoirement.
Autre constat, il aime pas microsoft:
http://wonder-tonic.com/geocitiesizer/content.php?theme=2&url=http://www.microsoft.com/en/us/default.aspx?redir=true