Mac OS/X and Rails 3 ?

rubyonrails-talk
1

Simplest way:

Make you are up to date with rubygems, which is what DHH was referring to with

gem update --system

Then run:

gem install rails --pre

If you are NOT using RVM, add sudo in front of each of those.

Niels

2

Have you checked this – http://railscasts.com/episodes/200-rails-3-beta-and-rvm