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Didn't know what "stack and tile" was all about, but it piqued my interest; http://www.cs.auckland.ac.nz/~lutteroth/videos/stack-and-tile.html
Great stuff! I hope there's more to come.
I've written my own tiler with "wmctrl" that can't do stuff that obviously needs to be implemented at a low level in the window manager, but it does give me some rudimentary tiling support anyway.
Free floating windows, without the ability to manage them in a slick fashion, is so '99. I wish "the big 4" dared to innovate a little bit more (looking at you OSX, Gnome, KDE, Windows).