Just keeping everyone updated with progress. I have decided to use Assembla for tracking tickets/milestones on this job over my old favourite Unfuddle (thanks to Too Pixel for convincing me a while back).
So PyroCMS will be managed with:
Assembla - Planning
GitHub - Source control
They both integrate nicely too so no duplication of effort. Not sure which will have the wiki but can worry about that junk later.
Follow me on GitHub or Twitter to receive updates on my progress and if anyone fancies helping out with bug testing then I will be importing the current codebase into Git tonight. The code I add tonight will be pre-alpha for a few days so the obvious warnings apply.