One should not fail to mention that esteemed former PhD student, long-time Age of Kings show-off and much besides, Simon Egenfeldt-Nielsen, handed in his massively multi-page PhD dissertation on games and education quite recently.
We who are about to write salute you.
Update: Simon’s timely thesis will be the third game dissertation from our center. The two first were Lisbeth Klastrup‘s Toward a Poetics of Virtual Worlds and Jesper Juul‘s Half-Real (warning: Pretty big PDFs).