On a Serious note,
1. Analysis Tool:A system like Admissions 411 to allow GMATClub users to enter their stas and compare them with others (including application details) would really be helpful.
While I like admissions411.com's idea, I still think the UI is kind of clunky and the members not as lively as GMAT Club! Maybe a feature to extract the information into excel format for Analysis would also be great! Better still an online analysis tool to 'slice' (filter) the data and present different views of the data maintained would be very useful. For example sort the data based on different sorting criteria!
2. Communication Tool:A system to allow GMAT Club Online users to chat with one another and also in an IRC like Chat Groups! This could be used by members for real time interactions and also by experts like Paul Bodine (OR invited adcom members) to conduct information sessions etc!
3. Blog:Allow users to maintain their admission BLOG or link to a blog external to GMAT Club
4. Customizable Front PageIt would be nice if the landing/front page of GMAT Club was customizable to allow users to include RSS 'widgets' with information extracted from other notable MBA/GMAT sites like Business Week/EIU etc.
5. Post MBA data analysisWhen GMAT Club was formed, it focussed around GMAT Takers and their issues. Now it has evolved with the community into a more generic MBA forum focussing not only on GMAT but also on MBA admissions. As these members continue move on to start their MBA and later into the post MBA world, it would be nice if we had some tools (maybe a variant of admissions411) to capture post MBA statistics (like industry graduates end up joining, starting salary, activities they participated in school, internship etc etc) in another table which can be classified based on schools! Again a dynamic online analysis tool to sort and present the data would be really helpful!