Did you know that you can simply type "gem server" at your command line to start up a web server on port 8808 that presents all the built-in documentation for your installed gems?

This seems to be a little known fact among Ruby programmers, but worth a lot I reckon. I have rediscovered this feature a couple of times and it's enormously useful, especially when working on the train so having to rely on local documentation. It certainly beats ri for many things.

Picture 6
Oh and that's the new Safari 4 beta, if you're confused by the look of the browser window in this screenshot!

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