* There are several organizations, agencies and committees with similar goals _inside_ each institution (university / high school). Given that your goals are aligned, it would be nice to see a way to onboard entire organizations (i.e. groups of students / mentors) -- even if it is not from the general frontpage. That way, you can think of Meritful as a SaaS provider for each of these orgs, and it also solves your critical mass problem.
* Student orgs (High Schools, etc) come in with well-articulated reasons as to _why_ I (a potential mentor) should work with them. This helps me make a decision along the lines of "I am looking for a group of 10 students at grade level 8 who are interested in astronomy and are free on Thursday evenings for all of Fall 2012. Can your group match that?" Note how this is different from scouting talent -- mentors just have more constraints.