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One thing that I miss from phpNuke was a new module that started development last year called Workboard. Perhaps it's along the lines you are seeking?
http://www.burnwave.com/In short, it's a simple workflow package. When I used it early on it was only good for showing assignments and I know it's been worked on since then. It gave everyone an idea of where we were stood and who was working on what. But it was limited....
That mod didn't fit our needs in the end. One of our team members had a license for Microsoft Sharepoint Services which was much more robust (but third party and $$$). That worked out for us much better.
I'd love to see a module developed for XOOPS for project management. We all have our side projects and many of us collaborate and need some way to keep energies focused.