John Walkenbach is a legend in the world of Excel. He's a prolific author on the subject, a Microsoft MVP, and has written several popular Excel add-in products to boot.
Walkenbach was a pioneering blogger on Excel subjects, but eventually pensioned off his day-to-day output, as others including Microsoft's Excel development team were able to put more resources into the task.
Nevertheless, he still has a hand in the Spreadsheetpage.com site and maintains an entertaining blog about "stuff that may or may not interest you" that ranges over topics such as politics, popular culture, travel, and banjos.
Walkenbach is still very actively involved with Excel and as a favor to other enthusiasts, he has compiled the ultimate list of Excel RSS feeds.
The page itself is very clever mini-reader that allows you to select a blog from the blog roll on the left and displays recent postings and comments in the main part of your browser window.
If you use an RSS reader, he has also created an OPML file containing these feeds. Importing the file to your RSS reader will automatically subscribe you to all the feeds. It's a very tidy little resource.