I stumbled into this four line ruby script that will serve up all of the rdoc documentation for your server's currently installed gems:
1 2 3 4 | #!/usr/bin/env ruby require "rubygems/server" options = {:gemdir => Gem.dir, :port => 4242, :daemon => true} Gem::Server::run(options) |
Thanks to Daniel for the ruby code!

hi,
a "gem server --deamon -p 4242" will also do the trick