Hi,
I've recently downloaded the trial version of Groupy, which seemed to be an interesting piece of software, offering the kind of features that I was searching for. I am also a heavy user of VirtuaWin, which is (for me) the best virtual/multiple desktop manager that you could find on Windows. Unfortunately, it appears that mixing Groupy and VirtuaWin generates quite strange effects, such as a blinking ghost window when switching from one virtual desktop to another. This bug is really annoying, and destroys totally the benefits of Groupy.
I don't know if there is a bug tracking list for Groupy, so I post this message here, to get some feedback from people who know the software better than me...