125×125 ad block typically used in the sidebar of a blog
468×60 ad block usually positioned in or under individual blog posts
300×250 ad block used in blog posts or at the top right of the sidebar. If you have two sidebars as seen in this blog, coding or a plugin is necessary to span both sidebars as the ad here does.
160×600 usually used in a narrow sidebar. Could be used in a blog post.
120×600 could be used in a blog post or sidebar.
120×60 used in a sidebar or blog post.
Media sponsors logo collage
728×90 usually used in an ad space created with code positioned above the header in a blog.