This question made me go "huh?"
Then I thought about it a little and found a FireFox extension that does just that!
Yeah we know that you don't have time to read ALL the Blogs that you want to! At last check my RSS reader had over 300 feeds. We found a little FireFox extension that made us go "wow, that's pretty cool." And they called it RovR.
Let RovR fetch (get the play on words?) relevant information from your selected blogs about the page your are currently reading. Rovr fetches posts from your favorite blogs about anything you're browsing, and shows you summaries where you can open and read posts without leaving the web page you were on. Blogrovr also suggests popular items AND lets you Twitter about any site you're on too.
BlogRovR shows you what YOUR favorite bloggers have to say about anything you're browsing, discreetly and on-the-fly as you browse.
Tell BlogRovR the blogs you like, and from then on, as you browse the web, Rovr instantly fetches you posts from them which link to whatever web page you’re viewing.
Rovr’s resizable tray slides in to show you summaries of posts about the current page. Click on a summary to read the full post, right on the page it’s about, or CTRL-click to open a new tab on the blog post.
Rovr helps you discover content from particularly relevant blogs.
BlogRovR also lets you Twitter about the pages you're on from the toolbar, search through just your blogs from your Blogrovr homepage, and get personalized suggestions from new blogs. Download it here.