The jQuery - YUI3 Rosetta Stone is a guide to idioms in YUI3 and jQuery, intended as an aid for developers who are familiar with one library and are interested in using or learning more about the other. It may also be helpful as a general cheat sheet for both libraries.

For Ext community, it would be nice to see Ext Core added into the rosetta stone, it will be helpful for jQ/yui developers jump to Ext family

anyone interest can git the repo source here.