HTML Workflow designer w/ Drag and Drop
html, html5-canvas
Solution
This question is quite old but in case anybody needs an updated answer, I would definitely give a try to the jQuery opensource project jsPlumb https://github.com/sporritt/jsPlumb.
Problem
I have a need to build a workflow tool, allowing people to drag nodes onto a canvas, connect outlets of nodes to inputs of other nodes.. Zoom.. (An example I just found looks like the one covered in the 'automation' section here: http://bronto.com/platform/features) Looking for suggestions on how to get started... Curious if there are frameworks/libraries anyone would recommend to make this easier, or just confirmation that I should just start whipping out Javascript to handle the drags/drops/line drawing/etc.