Forum Patrol: Bokeh wars, full-frame vs APS-C
One of the busiest threads right now in the dpreview Canon forums is a technical discussion on DOF/Bokeh with full-frame vs APS-C. The discussion started with an attempt at debunking the myth, but then took a life of its own. You need at least half a standard pot of coffee to read through the whole thread.
Update: If you don't want to read the whole discussion, dae44 (see comment #1), recommends this forum post by "Ribber" as a good summary of the debate.