I'll do another one of these since it's relevant to recent dev work for an upcoming release--The favicon! In March 1999, Microsoft released Internet Explorer 5, which supported favicons for the first time. Originally, the favicon was a file called favicon.ico placed in the root directory of a website. It was used in Internet Explorer's favorites (bookmarks) and next to the URL in the address bar.
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Parsing favicons from 1999, 2000... their usage was quite rare. It appears that the adoption wasn't really incorporated until tabbed browsing came along 2002-2004 (to help distinguish tabs through iconography). Furthermore, early IE only looked at the server root (http://domain.com/favicon.ico), so individual user sites couldn't have their own favicons.