JustBought.it was a site I ran across before but didn’t bother listing. Well their UI is updated and they have some more features in place that allows you to share information on something you just purchased.
It then will merge the tweet with a picture with a Google Map as best it can. Shopping trends then show, by category, on the right showing what people are buying. There was about eight current trends you could sort through.
You can rate, save to a lightbox or even share the tweet from the main page. This instantly starts creating a community around shopping habits of you and your friends.
If you have an online shopping site you can “white label” the site to include it in your store and have people share what they bought.
You are able to see the latest tweets on both the homepage and a tab, view tweets on a map to find shopping deals or hot spots and a link for featured shoppers that tweet what they buy. Mashable had a good review of the site also.