I really like this initiative for Windows 7 Ways to Change the World from Microsoft Citizenship(although a pity it is just for US Residents).
The competition encourages people to create short videos explaining how they believe a Windows PC could help a non for profits organisation make a greater impact. For instance helping a food bank manage their inventory or helping to deliver after school care for kids.
There will be 7 winners, and each person who submits a winning entry will receive a new PC with Windows 7 and a $7,000 grant for their chosen NGO.
The plan is also to keep all the entries online, providing NGOs with a great resource of ideas on how they can use technology