Brandmarker - The art group monochrom attempted to evaluate the actual power of commercial brands by making people draw famous logos from memory.
Brands of the World - A logo database of almost every big brand in vector formats. Also working as an exchange project where anybody can post vector logotypes.
Wordmark Info at Lawinfo.com - Explains the similarities and differences between wordmarks (logotypes) and trademarks or copyrights (at least under U.S. law).
