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Take Notice lets you add one or more notice boxes across your entire site. For each notice, you can customize the following:

• Whether to appear on all posts, all pages, or both
• Whether to appear on specific pages, categories, and tags
• Where to appear in the post (above or below the content)
• Color of notice box (grey, red, yellow, green, blue)
• Whether to display the notice title with its content

Take Notice is built using a custom post type, and is fully compatible with WordPress 3.0 and newer. You can add more than one notice at a time, and customize the above settings separately for each one. (See Screenshots for an example.)