I always have installed each version of Ruby in my local ~/bin directory and setup bash aliases to tweak my PATH to quickly switch when needed. I like having the source code to all of the gems I use ready at hand, so my installation scheme has always worked well for me. Being able to ZIP up all of my Ruby installations and move them to another system was another big win, as is not having to sudo gem install...
I spent the time today to install rvm on my fast i5 Ubuntu laptop, with Ruby 1.8.7, 1.9.1, Rubinius 1.0, and Jruby 1.5.0. Very satisfactory. I still have everything in my home directory where I want it, and my setup is easy to backup and copy.
I do almost all of my real work with 1.9.1 but I have been enjoying using Rubinius for casual coding.
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