Snow Leopardにアップデートした後に気をつけること 主にMacPortsとrubygemsについて - mizchi log
http://d.hatena.ne.jp/mizchi/20090827/1251358228
MetaSkills.net The Ultimate OS X Snow Leopard Stack For Rails Development - x86_64, MacPorts, Ruby 1.8/1.9, SQL Server, SQLite3, MySQL & More
http://www.metaskills.net/2009/9/5/the-ultimate-os-x-snow-leopard-stack-for-rails-development-x86_64-macports-ruby-1-8-1-9-sql-server-more
mxcl's homebrew at masterbrew - GitHub
http://github.com/mxcl/homebrew/tree/masterbrew

a package manager for osx using ruby git

alternative to macports

Neat approach to package management for OS X

is the easiest and most flexible way to install the UNIX tools Apple didn't include with OS X.