http://www.brandsoftheworld.com
2. Trademarkia is one of the largest trademark search engines in the world.
Each month hundreds of trademarks around the world are filed by licensed attorneys in the Trademarkia network!
http://www.trademarkia.com3. The Vectorial Logotype Bank
http://www.lalogotheque.com4. A minimalistic search engine dedicated to find vector logos, works very well.
http://www.seeklogo.com5. All Brand Of The World, Logo. More then 100.000 Logos.
http://www.vectorlogo.org/