Heres a tool for Blog Discovery: http://www.blogstreet.com/blogprofile.html

It has the follwing features:
A blog neighborhood is a list of similar blogs to the one that you entered. You can explore the neighborhood by clicking on the links to the blog, which loads the blog’s page in your web browser. If you like it, there are also RSS buttons available to quickly add the blog to your favorite blog reader/aggregator.

There’s also a "visual neighborhood" tool that uses the TouchGraph visual browser.

There’s also a form to discover "Googlatives," or blogs that Google thinks are similar to the one you’re interested in.

There are blogs everywhere on internet. In a very small period of time count of blogs have increased tremendously.

These days almost everyone on net is blogging and those who doesnt have blog are thinking of blogging.

There are several factors that lead the blogs to become so much popular :

Blogs can be easily upgraded: Blogs are very easy to work and maintian with. Like a website it doesn’t require any FTP information in order to make any chnages. Even a non technical person can set and maintain a blog. If you want to add some new content about latest happenings time to time then blogs are the best way to do that. You can just enter the new content without any HTML coding,simply by mail.

Anyone can have blog: Anyone and Everyone can have a blog wthout even having a registered domain name.In addition to this some blogs are available free of cost.

Easy way of communication: Blogs acts as user forums where they can discuss about their problems and queries.

Bsuiness Promotion: You can publish content related to your business on your blog and therefore promote your business. You can join various web rings and promote your business through blogs.

Blogs offer N number of benefits that you will get to know when you will set up a blog for yourself.