Glimpse.com

One part style guide and two parts shopping portal, Glimpse lets you browse for high-fashion apparel and accessories by look, category, store or brand. Search results conveniently pop up as a series of thumbnails displayed on the same page, and the "featured looks" pages—guides to how to dress like Drew Barrymore, Sienna Miller, America Ferrera and other celebs/style icons—are well designed, with tools that link you to where to buy Halle Berry's two-button blazer, let you request a sales alert via email or tell a friend about it. Featured stores include many of our favorites, like shopbop.com, Bluefly and Piperlime, the Gap's new shoe shop. ShopStyle, another chic shopping hub, lets users post images and links to items they like, and the SheFinds section (written by the site's fashion editor) offers outfit guides and trend alerts. The hot swimsuit this season: the monokini.