While on a quest, I found a link to the British Museum's online gallery. Very nicely done site with lot of interactive stuff to read and explore. I knew a little about Panini, but this story opened my eyes about his quest to write the correct grammar for sanskrit. Here is the story of how the Astadhyayi was born.
A very tastefully done online library about Mughal India is also something I found there.
The main site itself covers the most important civilizations of the world as we know it.