There are a ton of RSS readers out there and everybody has their favourite one. However, there is much more that can be done with RSS feeds besides reading them through your reader. Here are some good ways to get more out of your RSS feeds:
1. FeedMingle:
FeedMingle allows you to merge multiple feeds into a single feed. Works with RSS, ATOM and JSON and even converts you multiple feeds into a single widget that can be embedded on a blog or website. 
2. MiniBoxs:
MiniBoxs lets you create a start-page with all your feeds on it. It is like an RSS magazine that you can set as your start page and read all your RSS feeds. It has a better navigation and user interface than most of the readers and can be customized the way you want. 
3. Mloovi:
Have your feed in a different language? Use Mloovi to translate your feed to and from 43 different languages. Mloovi uses Google translate to do this and can also help you find the RSS feed if you specify a web page. 
4. FeedMySearch:
FeedMySearch turns your Google search results into RSS feeds. This way, you will always be updated if the results change and a new item is added.
5. Feedity:
Feedity allows you to track changes to any website through RSS feeds. You can also aggregate RSS feeds and use Feedity to track specific Ebay search listings and YouTube videos. 
6. Tabbloid:
Feed readers can be boring with so much text. Tabbloid can help you turn your RSS feeds into a magazine. Just specify your feeds, choose a frequency like daily, weekly and enter your email address. Tabbloid will then turn your feeds into a magazine and email to you daily or weekly (as specified).
7. SpreedNews:
SpreedNews lets you read your news faster. The innovative technology filters out some of the words and present it in a way that is faster and easier to read. Just customize the reader by adding your RSS feeds.
8. ReadTheWords:
Don’t have enough time to read your RSS feeds? Listen to them instead. Use ReadTheWords to convert the text of your RSS feeds into speech and listen to it whenever you want. You can also choose a male or female reader, set the reading speed and download your readings to listen to them later.
9. SuggestRSS:
SuggestRSS make suggestons based on your current RSS feeds. You can also find this feature in your Google Reader or BlogLines. 
10. GetClicky:
Get analytics for your website in your RSS feeds. You can do everything in GetClicky that you can do in Google Analytics or any other similar service with added features like real-time tracking, Twitter analytics, dedicated mobile versions and download tracking. 
11. xFruits:
Saving the best one for last. You can do almost anything with your RSS feeds with xFruits including RSS aggregation, RSS to Web, RSS to PDF, Mail to RSS, RSS to Mobile and a bunch of other features. It is a complete package for all your RSS needs. 
