Here's a good list of different groups claiming to
coordinate efforts to help victims of the
Gujarat earthquake:

 http://www.indiatogether.org/relief/quake.htm

(I got this from the generally good India etc. site:
 http://www.lbbs.org/southasia/southasia1.htm)

Personal contacts suggest that the
Association for India's Development
 http://www.aidindia.org/gujarat
is serious and reliable.