TODO list, in order of importance:

 * colspan/rowspan (snap)
 * freely resizable (e.g. using your mouse, for now) percentage of rows/cols
 * fullscreen (handling of applications)
 * fullscreen (implementing a mode, like default, stacked)
 * tags+xinerama
 * clean up the source code
 * document stuff!
 * more documentation!
 * think of some IPC mechanism, implement it
 * debian package
 * initial release

TODO for later™:
 * floating