I had never heard of such things until I read the first part of your review yesterday, Mouser, and I went straight for the open source option, and it's great! DM2 is very stable and its 'minimize to floating icon' feature is excellent. I also like the fact it includes virtual desktops, which I have often found useful, but seldom continued to run for more than a few days, because many of the solutions I've tested have been quite resource-heavy. DM2 runs so light that it's no problem at all just having it there in the background, and I can use the second (third, fourth ... eighth) desktop when I need it. I haven't tested any of the others, because I don't think it is likely I would pay for this kind of software. Thanks for pointing out a whole new category of useful programs.