I just finished the first release of ruby-epoll. There's no documentation yet, but there is an example chat server to give you an idea of how to use it. Things to do:

• Add documentation
• Get it up on RubyForge
• Fix bugs
• Add some esoteric features that might help make it more scalable

ruby-epoll is released under an MIT license.

Try it out and let me know how it breaks for you (Linux 2.6+ kernel with epoll(4) support required to build and use).