Download
Download Ruby.dictionary.zip file (3.8MB, works only with 10.5 Leopard) and proceed to installation instructions. Windows and Linux versions are available here.
Installation instructions
Unzip downloaded file into ~/Library/Dictionaries folder if you want to keep this dictionary only for yourself. You may need to create this folder if you haven't installed any dictionaries before.
To make it available for all users on your computer, drop the Ruby.Dictionary folder into /Library/Dictionaries folder.
To make the searching with Spotlight work, open Dictionary.app preferences pane and drag "Ruby" from the dictionaries list from bottom to the top because only the first one in this list will be searched from Spotlight.
Donate!
I'm confident that using API documentation this way will save you a lot of time but generating and maintaining it will take a lot of mine. If you feel like donating, you can do this right here. If not, i could not be happier when you find it useful.

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