Based on jpantuso's gist: https://gist.github.com/1110217
App store http://itunes.apple.com/us/app/xcode/id448457090?mt=12) The download/install takes awhile so start it first. When it finishes downloading you will still need to run it to complete installation.
iTerm2 http://www.iterm2.com/
Really the nicest choice for a terminal on OSX right now, especially with Lion style full screen support.
Homebrew http://mxcl.github.com/homebrew/
ruby -e "$(curl -fsSL https://raw.github.com/gist/323731)" Note that Xcode is a pre-req for Homebrew
rvm install 1.9.2 rvm install 1.8.7 rvm notes See if there is anything in the rvm notes you need to take action on. As of this writing the compiler needs to be overridden. Create a .gemrc file and add the line gem: --no-ri --no-rdoc
brew install git
bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)
Get a DMG based and pre-compiled install from http://www.mysql.com/downloads/mysql/