BlogPulse
- An automated trend discovery system for blogs. It analyzes and reports on daily activity in the blogosphere.
- http://www.blogpulse.com/

IceRocket Blog Search
- Search can be restricted in several ways.
- http://blogs.icerocket.com/

Google Blogsearch
- The goal of Blog Search is to include every blog that publishes a site feed (either RSS or Atom).
- http://google.com/blogsearch

Read A Blog
- View new additions, most popular, top searches and recently viewed.
- http://www.readablog.com

FeedMiner
- RSS and Atom feed search engine
- http://www.feedminer.com/

Plazoo
- RSS search engine for news and blogs. Allows users to create personal RSS feeds on merged feeds, search results, and personal interest profiles.
- http://www.plazoo.com

FeedBeagle.com
- Customized news and feeds.
- http://www.feedbeagle.com

Blawg Republic
- Search engine and directory for law blogs. Provides full text search, RSS feeds, and top links in the blawg community.
- http://www.blawgrepublic.com/

Feeds Farm
- Provides article summaries and search results in numerous different syndication formats.
- http://www.feedsfarm.com/

Postami blog tracking
- Search blogs by keyword throughout the world.
- http://www.postami.com

Popdex
- Search allows for finding words in news, referenced links, blog URLs or descriptions and also allows for finding all blogs pointing to a particular link.
- http://www.popdex.com/

Feedster
- Search engine for RSS feeds, which constantly monitors the world of blogs. Includes an image search.
- http://www.feedster.com/

Technorati
- Real-time search for user-generated media (including weblogs) by tag or keyword. Also provides popularity indexes.
- http://www.technorati.com/

Blogdigger
- RSS search engine, providing full-text search, as well as metadata search on RSS information. It has link search funtionality, as well as searching by date, topic, title and other fields.
- http://www.blogdigger.com/