We added code at least a year ago to prevent people from building gems with the name of a gem already hosted on rubyforge. That being said, the rubygem library

We added code at least a year ago to prevent people from building gems with the name of a gem already hosted on rubyforge. That being said, the rubygem library itself really needs some type of namespacing solution to solve the problem once and for all instead of requiring gem hosts to implement hacks like we did. Fortunately, I've heard rumblings that they may be working on something.