OpenStreetMap contributors from all over the world have from Nov 9th until Nov 30th (21:00CET) created/added the following new objects in the area where Typhoon Haiyan hit.

• 448.797 buildings
• 34.713 roads
• 7857 residential areas (tag landuse=residential)
• 4060 rivers

Regarding collapsed or damaged buildings the OpenStreetMap contributors have so far been checking and adding tags for

• 36.862 collapsed buildings (tag building=collapsed )
• 16.723 damaged buildings (tag building=damaged )

Source - Geofabrik hourly geodata updates (downloaded a copy 21:00 CET Nov 30th).

See also Pacal Neis hourly stats. with numbers of contributers and map changes (The numbers Nov 30th 21:00 CET - 1549 contributers which have made 4.078.767 map changes)

Still want to contribute? You can start reading the Wiki page regarding the Typhoon Haiyan mapping project.