Image (banner): 360 x 240 px or 720 x 480 px for high resolution displays
File type: static jpg or png
No animation or flash
Prohibited Content
Misleading text and use of images
Copyright infringement or the use of other brands, celebrities, logos, or images in your ad (i.e. use of the google logo or reference to their brand)
Sexually provocative images and text
"Scareware" - scaring the user by misleading them to believe they have a virus or malware or at threat of being infected with such if they don't install advertised software, plugin, update, extension, etc.