I like your second idea, but not the first....unlike OPM, SDN is not self-policing. And since I am the self who would have to police all of those threads, and I don't have any experience with TPR or EK, I'm going to have to ixney that idea. The other problem is that students tend to want to post actual questions. I don't technically think we are supposed to post test prep questions, and I certainly don't want to encourage people to post MORE of them. As it is, I never allow any AAMC questions to be posted, not even from the practice exams. So far I haven't gotten a nasty PM from Kaplan or TPR complaining about my allowing students to post a few of their proprietary questions, but they might decide to do something about it if people just start posting tons of them....
I like the topic of the day idea, but I think it is more reasonable to do a topic of the week, and to do it in the main MCAT forum. Maybe they can be motivational/philosophical/encouragement threads as opposed to just straight Q and A. What do you think of that?