Interesting; even though all repositories have been wiped from _why's Github accounts, the hpricot wiki is still alive: http://wiki.github.com/why/hpricot
I hope it stays that way, I wouldn't be able to figure out how to use it just by looking at the method definitions.
As is the wiki for Shoes (http://wiki.github.com/why/shoes)... I don't know if they were forgotten, or this was on purpose to help people who were going to keep the projects alive.