I have ordered several books now from flipkart.com, and I am IMMENSELY satisfied!!
They deliver with 3-4 days, often give 40% discount, and they take cash on delivery! What else does one want?!
I have even gotten books that are not easily available in India, delivered by flipkart.com within 4-5 days! The packaging is perfect as well. Plus, during the festive season, flipkart.com tried to deliver a book twice when I was not at home, and without any complaints they delivered it a third time! Plus, for each failed delivery, they sent me email apologising for the failed delivery and indicated that they would try again! What service! That too, at 30%-40% discount over regular bookstores!