I'm a big online window shopper. I like seeing what's out there, and I like to compare products across stores. I'm usually on the lookout for a specific item, so I use ShopStyle all the time - looking for a pointed toe flat under $100? Here are pretty much all of the options out there online. It has saved me so much time over the last 1.5 years - I don't have to jump around to each website to see if they have anything similar, I can just type it in and look to see what's available. I was just using ShopStyle this morning to see what striped shirts are out there for less than $50 when I found what looks like my ideal shirt. I don't think I would have ever found it just clicking around between stores, but now it's on its way to me and for less than $15!
ShopStyle has added a new feature where you can write and read reviews of the products out there. To celebrate this new feature, they are holding a $1000 giveaway. All you have to do is sign up for an account (obviously free) and review something you already own or have tried on in the past! If you use ShopStyle links on your blog as I do, you already have an account so just write a quick review, and you will be entered the win the giveaway. The more you review, the more entries! Good luck!
Disclosure: I was compensated to announce this giveaway. I'm an avid user and fan of ShopStyle and love supporting those who support me.