Getting RVM, Ruby 1.92 and Rails3 installed on my machine

rvm_rails3_install.sh

# Resources:
# 1. http://amerine.net/2010/02/24/rvm-rails3-ruby-1-9-2-setup.html
# 2. http://rvm.beginrescueend.com/

# Dependencies: MacPorts, with readline and mysql5 installed

# Side note, under no circumstances should you run any of this using sudo.

# install rvm
bash < <( curl http://rvm.beginrescueend.com/releases/rvm-install-head )

# install 1.9.2
rvm install 1.9.2 -C --with-readline-dir=/opt/local,--build=x86_64-apple-darwin10

# optionally install 1.8.7, at a higher patch level than SL's latest...
rvm install 1.8.7 -C --with-readline-dir=/opt/local,--build=x86_64-apple-darwin10

# set 1.9.2 as the default:
rvm --default use 1.9.2

# create the rails gem set:
rvm use --create 1.9.2@rails3

# should see this:
#jeff@absolom ~> rvm list
#
#rvm rubies
#
#   ruby-1.8.7-p330 [ x86_64 ]
#=> ruby-1.9.2-p136 [ x86_64 ]
#jeff@absolom ~> which ruby
#/Users/jeff/.rvm/rubies/ruby-1.9.2-p136/bin/ruby

# install utility belt:
gem install utility_belt

# install mysql
env ARCHFLAGS="-arch x86_64" gem install mysql -- --with-mysql-config=/opt/local/bin/mysql_config5

# install rails3:
gem install rails