Ruby 1.9.1, the stable release, is just around the corner and if your like me, maybe you want to start playing around with it and perhaps test a few projects using 1.9 with edge rails 2.3. If so, and your on a Mac, then perhaps this installation method might appeal to you. I'll break this article up in two parts, the first will be on installing multiple versions of ruby and how to switch between them while the other will be some things I noticed when testing ruby 1.9 with edge rails on my favorite pet project HomeMarks.