Collaborative hyperlinked story in the form of a text adventure:
http://www.textbasedadventure.com/1/ (courtesy @chrisdrackett via @liza)
David Kinder has released Git 1.2.4:
http://tinyurl.com/c976a9 (possibly broken url)
html
Ernest Adams in Gamasutra argues that adventure games as a genre are doing pretty well:
http://www.gamasutra.com/view/feature/3990/the_designers_notebook_the_genre_.php