I have to agree with a few other posters, nothing makes me more productive than listening to techno while I program (Specifically the DI.fm Eurodance channel). It almost feels like my thought processes get structured on top of the beat, using it is a foundation for the flow of my work. It is only really useful when I am actually writing the code though, when I am working on high level design I tend to turn it off. Weird thing is, I don't even really like techno. It isn't something I listen to at home, and I don't like the club scene. When I'm working though, nothing is better.

This is one of the features I've been looking forward to in 2010, and while it is nice in the beta, I hope they can improve upon it before release. I think the most irksome thing, is that while the windows can float, they are still linked to the main interface. So for example, if I've pulled a code window out to my right monitor, and bring something up above Visual Studio in my left monitor, as soon as I click the code window VS in my left monitor comes to the front. If I minimize VS, the ripped away code window goes away as well. Furthermore, you have only basic sizing control of the torn away window, you can't individually minimize it. I have no idea if these things are even something they could do with the new WPF UI architecture, but they would be nice.