I normally shop online, especially in sites which are safe, ensure proper delivery at the said quality.

I am just compiling a list of shopping web sites in India that are popular and one can look to try and start with

SnapDeal - Online Shopping in India: Buy mobiles, laptops, apparel, shoes & much more at Snapdeal.com

Snap Deal is probably one of the cheapest online shopping websites (10% cheaper than Flipkart on some products). Best part is, They sell products on pretty much all categories like Electronics, Appliances, Home Entertainment, Kitchen, Health, Sports and So on. Cash on Delivery Available

It is one of the best cheaper alternative to Flipkart
Flipkart - Online Shopping India - Shop Online for Books, Mobile Phones, Digital Cameras, Watches & More at Flipkart.com

Flipkart is by far the most trusted online shopping website in India. Pricing is higher than Snap Deal, but they have their own subsidiary which delivers the product. Cash on Delivery Available

If you are looking for same day delivery (Or) next day delivery, Flipkart is the place
Amazon India - Online Shopping: Online Shopping in India for Books, ebooks, Mobile, Laptops, Tablets, Cameras, Sarees, Salwar Suits, Watches, Jewellery, Shoes, Hangbags, Luggage, Video Games, Kindle E-Readers & Accessories and More - Amazon.in

I have not used Amazon so far, but it is a US based reputed company, which has been in online shopping business since pretty much the early days.

Amazon i think is also cheaper compared to Flipkart.
Jabong - Online Shopping India: Shop Shoes, Clothing, Bags, Watches Online in India

Jabong is probably the best for Fashion Shopping for men and women. I once used it to buy a school bag for my kid. I replaced the product with a different size and i was very satisfied with their swift handling of replacement as well.

You also get a lot of good deals with them.