Lookwork, because Ben Pieratt is a genius and starting one revolutionary web app (svpply) isn’t enough. Lookwork is part feed reader, and part searchable stream of inspiration. Similarly to svpply you can filter your stream to find something more specific and even follow other folks to keep tabs on what they are looking at.
Part of why Ben Pieratt’s work in web applications sets a gold standard is due to the fact that he understands a complicated or rich UI should never take away from a user’s ability to complete the their goals. I think everyone designing for the web can and should take some notes from Ben on interface design, and also the problems his apps solve.