Banner Advertising Specs and Formats - Microsoft Advertising - Europe
(44) Which banner ad sizes account for the most click volume in the Google AdWords Display Network? - Quora
Yahoo Ad Specs: Standard Units
IAB Display Advertising Guidelines
Image sizes for image ads - AdWords Editor Help
Top 10 Most Effective Banner Sizes
Create image ads in different sizes - AdWords Help
Online Jargon, Acronyms, and Texting Shorthand :-)
AOL Advertising Ad specs | AOL Ad Units