This might sound heavy-weight, but if you want to present for an audience of Ruby enthousiasts, this might be for you:

The Belgian Ruby User Group is happy to announce the second Ruby and Rails devroom at Fosdem 2009. Fosdem is a gathering of Free and Open Source Software developers and the ideal occasion to meet fellow Ruby and Rails developers (and 2,000 other FOSS developers). If you have a good idea for a talk or tutorial, consider sending in an abstract. You can find the Call for Papers at http://wiki.rubyist.be/wiki/show/CallForPapers

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