Carlos Pagan: http://www.carlospagan. com
Designed the Pinterest logo
Identity Designed: http:// identitydesigned.com
Excellent ID blog. A lot of international stuff
Pentagram Marks: http://www.amazon.com/ Pentagram-Marks-Partners/dp/ 1856696685/ref=sr_1_2?ie=UTF8& qid=1352330395&sr=8-2& keywords=marks%2C+pentagram
This book contains all of Pentagram's Logos. I purchased it and find it extremely inspiring.
Saul Bass Logos Then and Now: http://annyas.com/saul- bass-logo-design-then-now/
A rundown of famous Saul Bass logos and how they fared over the years.
Aaron Draplin: http://www.draplin. com/1998/01/identity_01_1.html