Terry Marxen Adwords
The popular Adwords program supplied by Google requires 9 appropriately sized images
320 x 50 Mobile leaderboard
468 x 60 Banner
728 x 90 Leaderboard
250 x 250 Square
200 x 200 Small square
336 x 280 Large rectangle
300 x 250 Inline rectangle
120 x 600 Skyscraper
160 x 600 Wide skyscraper
All images less than 50kb