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Flipsy.com

Compare trade-in and buyback offers, sell for more. Quite an interesting site - if you have something to sell, such as a book, console or smartphone, what price are you likely to get? You could of course search completed sales on eBay, but you can also use this site which will give you estimates on what similar items have sold for in the past. Unfortunately it's US only, but it might give you some ideas!

Ziplist! Manage shopping lists.

Welcome To Ziplist!. Managing Your Grocery List has never been easier! Make printable grocery lists organized by aisle, access your list from the web or your mobile phone, create both personal and shared family lists, and many more time saving features!

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Compare eBay & Amazon product prices.

Q-Compare lets you compare prices. Simple choose country, category, enter query, click on search and see what you get!

WhosRich.me

WhosRich.me is a social utility that makes it easy for people to track their friends' shopping habits. This utility gives eager shoppers a scene to show off their new purchases and to receive feedback from mates.

Sososher - Savvy Online Social Shopper.

Sososher. Over 2,000 stores listed. Find stuff, buy stuff, chat to friends, get money off, all that good stuff.

Coupon shopping

Coupons, we've got them all - Tjoos. Basically a site that provides you with access to shopping coupons. Lots of US stuff, but also a good international section. Worth a look, since it's always being updated and checked.

Wists

Wists, social shopping scrapbook, wishlist. Social wishlists - everything you want for Xmas!

PropertyMaps

PropertyMaps "is a powerful searching tool that combines complete Multiple Listing Service (MLS) access with the easy-to-use interface of Google Maps."

Property search map - OnOneMap

Link: Property search map - OnOneMap. This is a great mash-up between Google Maps and estate agents. Find the bit of the country you're interested in, choose price, number of bedrooms, house/flat, near things, map layers, and it can be included in Netvibes, Pageflakes etc. Very cool - I like it a lot.

U Rate Stuff

URateStuff is a site where you rate stuff that you've got. Rather like Which.