Former Intelligence Bureau Joint Director Maloy Krishna Dhar's book -- Open Secrets-India's Intelligence Unveiled -- has claimed that the Babri Masjid demolition was planned ten months in advance by top leaders of the Sangh Parivar. The book also has many other revelations. Now Outlook magazine has a CD of a speech of AB Vajpayee, in which, just a day before the demolition, he asks the karsevaks to level the land. News reports say that Krishna Dhar has mentioned about this CD in his book.
So was Vajpayee part of this conspiracy? I would think yes. Not because of these new evidences though. He has always been a central figure in the Sangh, and an event of that order would not have taken place without his knowledge. In any case, now that there's some sort of a proof of his involvement, the Liberhan commission should look into it.
Here's a previous post of mine on Babri Masjid.
Update: Here's Venkitesh Ramakrishnan's review of Maloy Krishna Dhar's book in the Frontline.