It doesn't quite count as a tiling window manager, but I just use compiz with the grid plugin, and it gets me everything I wanted from a tiling window manager w

It doesn't quite count as a tiling window manager, but I just use compiz with the grid plugin, and it gets me everything I wanted from a tiling window manager without losing the ability to move a window around freely occasionally. That plus the cube, no window decoration (that really helps clean things up), and some convenient keyboard/mouse shortcuts makes for a really efficient desktop without the restrictions of a pure tiling window manager.