Research: Shopping Sites

Okay so after much painful research for online shopping.

THREADLESS.COM

Here are what I feel are the mandatory features of online shopping sites.
Title of product, Navigation to other categories, username/cart/logout, about the design. A previous/next in catalog would be good, although I feel it's fine without it, usually I'd just rather get back to the main one to click on the ones I'm interested in.

Nothing much here. AUCTIONS.YAHOO.COM

Perhaps ending bids. but oh, I don't need it for mine.

EBAY.COM (oops I forgot to attach my worthless watermark :/ )

It's very complex database and I'd most likely become suicidal trying to come up with such a wordy auction site like that, but what I found useful were the breadcrumbs, number of bids, last bid, price(haha), related searches.

Ok, still at ebay: This is what you get when you decide on what you want to buy.

This page is cool. I think picture enlarge/more pictures, credibility, FAQ (top right of page) are not bad, though not the most important.
I don't think end time is necessary for my project.

So to summarize the features that might be useful to apply, the most important ones are the ones that prove their point like, saying skyscrapers are actually tall buildings. For example, the title, about product, sign in, cart, manage trade, previous offer/bids, navigation, categories, and a search engine would aid efficiency when browsing for items. Adding HELP is a good thing, because imbeciles never run out of stock.