UPDATE -- post-Boston

Well, it's over, and it was a genuine learning experience. I have a bunch of backposts for the runs I managed to squeeze in before the race, but for now, here's some data from the official results:

Checkpoints
5k 0:23:40
10k 0:47:29
15k 1:10:41
20k 1:34:18
Half 1:39:19
25k 1:57:34
30k 2:21:53
35k 2:46:17
40k 3:11:37
Finish 3:22:03
Pace 0:07:43
Overall place 4872
Division place 562

I'm sore, but keen to do it again. More when I get time.