Version 2.2 is for Umbraco 6 - 2.1 and earlier for Umbraco 4.
Workflow for Umbraco allows you to author custom workflows using a drag and drop UI. You can have content authors or editors manually push content, media etc to workflows - or you can setup workflows to start upon API events (Document publish, Document Save etc).
Introduction Screencast: http://bit.ly/pDVtjM (more screencasts below)
I've set up an example repository of code that shows how to extend workflow here: https://github.com/darrenferguson/workflow-for-dot-net
How to create custom (runnable) tasks: http://vimeo.com/30190458
How to globalise tasks: http://vimeo.com/30840956
Using and creating delay tasks: http://vimeo.com/30873482
Decision tasks (default and custom): http://vimeo.com/30916953
If you have any issues or questions - please report in the forum below or contact me: http://www.moriyama.co.uk/contact-us/
Version 2.1 is compatible with Umbraco 4.7 through to 4.11.
Version 2.2 is for Umbraco 6.x only
A summary of changes in v2.1: