RSS feeds via email are an option, but I think most people who subscribe to feeds read blogs through a feed reader like Google Reader:
http://www.google.com/reader/You just subscribe to whatever you want to-blogs, news sites, online magazines or anything with a RSS or atom feed enabled, and your reader will let you know when something has been updated. If you read lots of blogs and you're not using a reader yet, you'll love it. Saves A LOT of time hopping around the Internet looking for updates.