http://www.thecoolhunter.net/ads/: the coolest things around the world in design, architecture, fashion, advertising, arts in general
http://www.trendwatching.com/: Independant and opinionated trend firm, scanning the globe for the most promising consumer trends, insights and related hands-on business ideas. They have monthly free trend briefings!
http://www.adverblog.com/: cool ad blog written by a friend of mine from beautiful Italy