This is a great interview. Specially since it is very clear about the shortcomings of the Ruby runtime.

Someone should port Rails to Scala :-)

The leading Scala web framework, Lift (www.liftweb.net), was made by David Pollak, an early Rails adopter.

Lift tries to take the best of Rails but it is far from a port.

"Someone should port Rails to Scala :-)"

You can run Rails on JRuby today and get many of the same benefits.

Would like to know if the Twitter guys even considered JRuby.