Windows XP has that (great) grouping icons thing. I was wondering if it would be implementable (or extraordinarily hard) to have a similar taskbar menu system for each task that you had running. Is anyone running this on their computer or know if it's possible?

Currently, I think there's no module for that. But, why not making your self-build taskbar, using RabidVWM and labels. A bit tricky, but possible to do. Then you could really do whatever test you like to opened WindowClass;WindowTitle...