I had the same problem Dough has with the time in emails. I submited the patch I have been using in my server since beta1, and has been put in hold for a long time.
What needs to be done to get this patch applied to the trunk? Anybody who doesn't operate on military time is definitely going to want this preference in there.
I'm curious in general about what it takes to get a patch applied to trunk. I've submitted two to the dev mailing list (one that allows tabbing to the Send button when composing a message, the other this 12 hour clock patch) and neither has really been commented upon at all. If there's a way to expedite review and acceptance of the patch I'd love to know, if there's not then I'll continue to do what I'm doing (send the patch to the dev list, submit it on trac as well).
Thanks,
Doug