OpenStreetMap contributors have from Nov 9th until Nov 21th (10:00 CET) created/added the following new objects in the area where Typhoon Haiyan hit.

• 370.108 buildings
• 29.214 roads
• 7278 residential areas (tag landuse=residential)
• 4089 rivers/streams

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

• 35.406 collapsed buildings (tag building=collapsed )
• 15.842 damaged buildings (tag building=damaged )

Source - Geofabrik Hourly geodata updates (downloaded a copy 10:00 CET).

See also Pacal Neis hourly stats. with numbers of contributers and map changes (The numbers Nov 21th 13:00 CET - 1336 contributers which have made 3.395.426 map changes (Sic!))

But there is still a lot you can do and help with. Start reading this wiki page Typhoon Haiyan and then go for some mapping.