A good article from Sulekha on the changing tactics of terrorism: Terror 'outsourced' in India.
Terrorist groups are relying more on native Indians to carry out terrorist attacks using crudely assembled bombs, whereas previous attacks were carried out by Afghan mercenaries or Pakistanis who used sophisticated weaponry.
Below is a map of terrorism in India that I created:
terrorism tagged map by user - Tagzania
I invite readers to make this map more complete by registering with Tagzania and tagging locations of terrorist attacks with "terrorism" and "India." I also request that readers identify source URLs for your information as documentation under Resources.