I buy a lot of books from Flipkart and am a fan - I love their prompt and reliable service !
I recently bought a new Samsung Galaxy 2 phone from Flipkart. I hate commuting and shopping, so the fact that I could buy this online at one click was great. Flipkart delivered the phone promptly in 2 days, and I am very pleased with the phone and their excellent service !
However, I was disappointed with the fact that the Flipkart shopping cart was not intelligent enough to sell me accessories for my new mobile phone. For example, I would have been happy to buy a screen protector film for my phone - but they did not offer me this choice.
Flipkart could easily do a better job with tracking customer behaviour - they just lost a chance to sell more products.