User blog comment:Sannse/How do you want to watch blogs/@comment-34115-20100205212710

From a usability perspective. It's standard for blogs to have an RSS and/or Atom feed for them. But also when a user goes to a blog page and sees a "Watch" link up at the top, they are going to be expecting that feature to work properly with the blogs. So it would be best to make both work and let people use which method of notification they want.