Glad to hear you are doing non-profit works. Here are my suggestions
1. A Blog module to keep the site content fresh - module News Articles from www.ventrian.com
2. An online newsletter - DNN built in Newsletter (available under Admin menu)
3. A Fund Raising module - Subscription module from www.ventrian.com
4. Donor Management - DNN Form and List
5. Membeship Management - Dynamic Registration from Data Spring and WorkControl-UserManager from
www.workcontrol.com
6. Event Management - DNN Event module
7. Project Management - Issue Tracker from opensource.indyneinc.com
8. Board of Director - DNN Document and DNN Forum
For 24.95, you can access a number of modules from
www.ventrian.com that can compliment the site. For example, you can use the Simple Gallery to show your organization activities. You can use Feedback Center to gather input from the community. The DNN Survey module is also a good tool to gather feedback.