A new tool called “Lazyfeed” is ready to debut, which’s an interest feed for blog items, and currently indexes about 100,000 of the most popular blogs and organizes posts by topic. The hottest topics, as determined by related tags, pop up to the top. On the home page it shows you the hottest topics of the moment, which offers an easy entry point into the service. You can also do searches for particular tags, and the most recent posts with those tags start streaming into the reader. You can save tags as favorites in the side bar. and return to them. The service might include Twitter hashtags in the future, but right now it is focused on showing the most recent blog posts about a particular topic.
More info: Lazyfeed