Good product search engine
Good product selection
Good product description including pictures
Good product links to manufacturer
Good pricing
Good product reviews from verified buyers (and unverified buyers too).
Good (read reasonable cost) shipping
Good customer support
What's left ?
VAPCMD
What would be a good alternative to http://www.tigerdirect.com?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic