Dunno abt overseas help, but there is a good network of blood donors.. News channels havent covered it yet, but I believe that people should be responding... 

We have many sites like bloodaid.com etc which rounds up people from all over India for blood donation, and also using twitter updates there...

Hope all is well for those affected... I have been to these areas last time, and I can tell you ths- they're really, really crowded in the evenings!