Whilst I've been away I've had a bug report for the TDD timer queue code that's available here. The report is completely correct and could result in a timer being scheduled out of sequence if it's scheduled around the point when GetTickCount() wraps. I've coded up a fix but I need to write it up and post it. It may take me a while to do this as I have a lot going on in my life at present, if you need the fix sooner then drop me a mail.
Updated: 4th April - Fixed code now available here.