There are so many valuable feeds out there that following every single one manually is no longer a possibility. It is only natural that tools like this one are becoming available.
Essentially, it will empower you to take two or more feeds and mingle them together. This would result not only in a unified RSS or Atom feed, but also in a HTML widget that you can paste on your site or blog at will. Additionally, you can use this application to mix different Twitter posts and create a single one. The same applies to blog posts.
The process itself couldn’t be easier. You simply add the feed URLs one by one by pasting them and then choose a title for the new merged feed. That’s it. It is interesting to note, though, that there is no need to paste the exact feed URL – if the browser shows the orange RSS icon in the address bar as you are navigating a page, that means that the page’s URL is also good to be pasted. As you don’t even need to register or create an account beforehand, you can give this tool a try right now and see if you like it or not.
FeedMingle.com In Their Own Words
“I mingle all your feeds into one to produce a combined RSS, Atom, JSON and a widget.”
Why FeedMingle.com It Might Be A Killer
It is a practical way to stay abreast of any development you might be interested in, and do so in a straightforward way at that.
Some Questions About FeedMingle.com
How many feeds can you combine? Is there any limit? 
