We activated to provide geographic base data in areas affected by typhoon Yolanda/Haiyan in the Philippines, coordinating on the Typhoon_Haiyan wiki page. Our maps have been used on the ground by aid agencies, for example the American Red Cross have equipped their teams with OpenStreetMap maps. Tying in with this, the British Red Cross have been working to help improve our map coverage... and you can too!
Hundreds of contributors have joined our effort by editing OpenStreetMap to make improvements in the Philippines. You can to!
As always, you can use these HOT resources: