Sorry about that. We're seeing intermittent issues with our Passenger installation. And we're currently upgrading the machine... we should be more stable, in a few minutes.
This release is intended to allow gem and plugin developers to test their libraries against the new code base before the RC's are pushed. If you find that you still have to monkey patch Rails for your library to properly work, we did something wrong and report it as a bug! Also, it is your feedback that will define the official plugin API for Rails 3.