Today, while browsing my ISP's forum, I somehow got to their calendar.
It basically has some events and/or user birthdays and etc. I would have gave you the link to see what I'm talking about but it's a local forum so none of you would be able to open it, anyway I am sure you all have seen it somewhere and know what I am talking about.

So what I think will be very good for BTG is a similar kind of calendar, but instead of birthdays it will have... let's say... users' test dates (assuming you create some kind of mandatory format for test dates, for obvious reason) for instance. It would be cool to know who is taking the test tomorrow or the day after tomorrow. Additionally, you could add different MBA/GMAT events like... i don't know... anything. Date/hour of Accepted.com's chats with admission consultants, some other online MBA event or for instance beginning/end dates for essay admission for your BTG/sponsors scholarships + scholarships drawing date and etc. Everything you can put a date next to.

While not mandatory it will definitely be a plus for the community.