I've just updated the GetBundles Bundle and the script which runs once a day to cache and provide all information. The problem was that github did change its URLs and API again. Maybe for the future to avoid such instances we could maintain a list of all github hosted bundles in a github repository ( only an idea :) .
@Shawn Parker I was able to install your WordPress bundle by using GetBundles version 1.4 :)
All the best, --Hans