During a conversion with John Resig at the FOWA he mentioned it would be useful to have a tutorial that explained what jQuery doesn't do that Prototype does and visa versa, and in particular how X process is done in each library.
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I've published 38 videos for new developers, designers, UX, UI, product owners and anyone who needs to conquer the command line today.
Below you can find the presentation I put together that goes through the core of both libraries and gives you a process by process comparison, explaining how to achieve each function in each library.
The slides should pretty much talk for themselves, but I welcome any feedback or questions you may have.