compare to Yuno and Yal
https://github.com/WebReflection/yuno https://github.com/WebReflection/yal.js
reply to https://twitter.com/#!/WebReflection
and https://github.com/kmalakoff/background
and https://github.com/scriby/asyncblock
and https://github.com/mrdoob/sequencer.js/blob/master/src/Sequencer.js
unit testing for Requirejs: https://github.com/mattfysh/testr.js
Here is another one for Node: http://tobyho.com/2010/12/10/trampolines-in-javascript-and/
Async manager, handles non-blocking really well: https://github.com/dfellis/queue-flow
and https://github.com/hagglund/use.js great ease of use