From Professor Frances Pritchett of Columbia, another stunning Internet resource: an online edition of Ambedkar's Annihiliation of Caste, which is based on a speech he gave in the 1930s. For those who don't know, Ambedkar was India's first high-profile Dalit ("untouchable") intellectual. He had a Ph.D. himself from Columbia, and was a major player in the independence struggle. He is also one of the primary framers of the Indian Constitution.
Pritchett's edition of his book is here.
It's fully annotated. Specific terms and names are hyperlinked and defined. Also searchable. This is about as good as it gets... It's almost a Wiki!
My only criticism is that she's using frames, so it's hard to link into the project -- you don't get unique URLs for each section.