2 members of the Knowledge Commission recently gave their resignation to the PM, as they were not happy with the developments regarding the Reservation matter and the approach that the UPA government is taking to tackle it.
The Indian Express has published the full text of the resignation letter that Mr. Pratap Bhanu Mehta gave to Mr. Manmohan Singh. It is in the editorial section of Indian Express on 23rd May, 2006. I would suggest everyone to read it, if possible. It clearly shows that even the UPA is internally divided on this issue.
Update : You can read the letter here -
Dear Prime Minister ...