DoublePane Window Utility Free July 4, 2011

I just wanted to give a heads-up that DoublePane, a window management utility, is free today, July 4, 2011. I’ve not used DoublePane before today, but I’m trying it out to arrange open windows in DEVONthink. From what I have seen thus far, I believe it will be a useful addition to my workflow to quickly arrange windows side-by-side. One feature that I like in particular is that it can be hidden in the menu bar to save space and called entirely by user-defined shortcuts.