Indiatimes Shopping and Sify Mall are currently running two similar kind of promo contest, wherein you can win Gift Vouchers of upto Rs.5000!

Indiatimes is up with Sabse Bada Aashiq Kaun - Here you will have to write a love note after purchasing anything from their stores..
More info about this is here..

Sify is up with similar contest, wherein you have to purchase something and write up a message for your Valentine, and you may win those vouchers. Whats more, if you purchase from there Valentine Stores, you get a free Movie VCD (more info about the VCD is here..) Interested go here for more info..