Do you feel some of your readers would want to subscribe only to a category in your blog rather than subscribing to all the posts on the blog?

There can be many more reasons why you would want category feeds . You may be someone like me who at times blogs about films and then once a while blogs something like this post ;o)

Quoted: NewsOnFeeds.com - online news aggregator and search engine - List of News Aggregators

Quoted: Easily subscribe to any RSS, XML or Atom feed, and have the results delivered to your email inbox.

Use PostRank™ to score, filter and track performance of any RSS feed. Reclaim your time, boost your productivity, and stay on top of the news.

RSS and a personalized widget tool have been added to iterasi, giving our community new ways to share and publish the pages they save with our personal web archiving service.

Quoted: PostRank is a scoring system developed by AideRSS to rank online content, such as RSS feed items, blog posts, articles, or news stories. This scoring system is based on social engagement, which refers to how interesting or relevant people have found an item or category to be.

Quoted: What's Snackr? It's an RSS ticker that pulls random items from your feeds and scrolls them across your desktop. When you see a title that looks interesting, you can click on it to pop up the item in a window.

Have you ever wanted to share something that you were reading, but you didn't want to go through the hassle of subscribing to a whole feed for a single interesting article? And what about sharing content from sites with no feeds? There you are, reading along, and you think to yourself, "If only everything on the web had a 'Share' button like in Google Reader!"

Addictomatic searches the best live sites on the web for the latest news, blog posts, videos and images. It's the perfect tool to keep up with the hottest topics, perform ego searches and feed your addiction for what's up and what's now.

Quoted: Addictomatic is a place to inhale the web.