Slide - a tiny flow control library
Callbacks are simple and easy if you keep the pattern consistent.
You'll laugh when you see how little code is actually in this thing. It's so not-enterprisey, you won't believe it. It does almost nothing, but it's super handy.
I use this util in a real world program.
You should use it as an example of how to write your own flow control utilities. You'll never fully appreciate a flow control lib that you didn't write yourself.
Just copy the files into your project, and use them that way, or you can do this:
npm install slide
var asyncMap = require("slide").asyncMap , chain = require("slide").chain // use the power!