An interesting web innovation with a peculiar name is a “Wiki“. The best known application is Wikipedia, which is a web-based encyclopedia where many users collaborate on providing the facts for the various topics. Another fantastic use of the technology is a Wiki App called JotSpot that provides much of the functionality of Excel over the web. I can foresee wiki technology becoming even more pervasive for business applications on the Internet.
Wikipedia uses MediaWiki found at http://www.mediawiki.org/wiki/MediaWiki