Hilton recently launched an India specific website at www.hiltonindia.com. There is a 20% off sale on the site at the moment, if you book your room nights before April 30, 2013 and valid for stays till December 30, 2013. Valid only for advance purchased room rates. Make sure you get the Gold status at the hotel chain for having a shot at upgrades.
Travelguru is offering a 3rd night complimentary on booking 2 nights at some of the luxurious Oberoi properties around India. These would be the iconic Amarvilas, Rajvilas, Vanyavilas and Udaivilas, and some other metro properties. It says offer valid for a limited period, and seems like one can book till October 31, 2013 at this moment.
There is also a direct booking promotion available with the hotel chain itself at www.oberoihotels.com, however more hotels available via TravelGuru.com. Take your pick.
Like I wrote the other day, Hyatt launched 5 new hotels under the Hyatt brand in India, so if you intend to stay at one of them till August 31, 2013 book with this rate to add free breakfast and internet to your stay.