Image ads can run in either the keyword or placement-targeted campaigns to appear in the Google Content Network. Keep in mind that content sites can choose to not display image ads, so it's useful to have text ads as a backup for those sites.
Specs
- Sizes: 468x60, 728x90, 200x200, 250x250, 300x250, 336x280, 120x600, 160x600
- Max file size: 50k
- Formats: .gif, .jpg, .png, .swf