Often we come across Indians who just don't work as IT Professional to make money, but also to support the poor Indian society. One such organization working online, serving throughout India is
FriendstoSupport -
A site which has organized the list of all volunteers who wish to donate blood and help the needy. Each volunteer has listed his mobile number and landline number to be contacted in case of emergency. You can enroll yourself if you wish to donate blood. Really useful for very rear blood groups such as O-ve etc.