The official starting point: "Be it resolved, religion is a force of good for the world." Spoiler alert: Blair argues the pro side.
Assuming the Munk people do not force YouTube to take them down, here are links to the nine segments of the debate: Part 1, Part 2, Part 3, Part 4, Part 5, Part 6, Part 7, Part 8, Part 9. The links will open in new tabs (or windows, depending on your browser).
The first eight segments are each about fourteen minutes long and the ninth is about seven minutes long. Total running time is thus about 23 ten-millionths of a century, which proves that two hours is effectively instantaneous.
I have also embedded these nine video segments below the fold, if you'd prefer that.
[Update: looks like the first segment got taken down, but that's just the intro from the moderator, so I don't think you'll be missing any of the Blair/Hitch part.]