Introducing KB New Posts, a plugin inspired by this support thread 
.
What it does
When somebody visits your blog’s main page, the plugin sets a cookie recording the time of their visit. If they come back a few days later, and you’ve written a new post (or many new posts) since their last visit, the plugin adds a CSS class to the new posts so that you can highlight them, or add a background image, or change the font size, or whatever you want to do to new posts.
How to use it
- Download the plugin (scroll down for the link). Unzip it. Upload the entire
kb-new-postsfolder to your plugins folder. Activate the plugin. - Visit your blog’s main page (so the plugin can set the cookie in your browser).
- Write a new post.
- Visit your blog’s main page. Admire the formatting on the newest post. (The font size will be slightly larger, and there will be a hokey background image.)
You’ll probably want to customize the CSS that gets applied to new posts. Read through the readme file for instructions.
Download
Here you go: KB New Posts, v 0.1