From a qualitative perspective it's a bullshit patent, full-stop. But yes, the legal process is prohibitive, but if you demonstrate prior art to the USPTO you can request a re-examination that allows them to save face.
If this patent were filed in 1988 it might have a hope of standing. It was remarkably filed in 2008, years after countless grid-based Windows manager had come and gone. It stands no hope, and the EFF will make quick work of this.
The USPTO needs to be held liable for this sort of nonsense, or alternately people who file spurious patents need to be penalized. This is legalized extortion.
And since this always comes up - someone is going to say "read all the claims...this is novel only in its entirety". The claims of a patent, unless specifically cross-referencing, hold independently.