After re-installing RVM on my development machine I then found I could no longer interact with HTTPS services. This is how I fixed it.
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Another very quick post showing you how to fix the most common error you get when installing the mySQL gem on a clean Ubuntu installation.
Setting up a laptop for ruby development on Jaunty and getting mkmf load errors?
This is the easiest way to get RMagick installed in Ubuntu Intrepid Ibex for Ruby
This is something that baffled me for a good few months until I finally figured out what the hell was going on. If you develop in rails chances are you'll either be using Mongrel or WEBrick to run it locally, but sometimes when I went to start either of them I would get a "This port is already in use", which wasn't exactly fantastic.