Our 2007 picks are the best examples of what's new and exciting about the Web right now. Here we honor sites with exceptional style and smarts, sites that offer new and improved ways to access and share content, generate our own and otherwise enrich the online (and off-line) experience. — By Maryanne Murray Buechner Arts & Leisure From Photonhead to Yapta Audio & Video From Last.fm to Veoh News &