Where to list?

There are a lot of directory listings out there, so how many should you enter your blog into? I have entered my blogs in several but found Blog Catalog to bring in the most hits so far. Their system is simple, efficient and very quick. It's very quick to add your blog and once they check it out, and approve it, you will start getting hits from them. Another good option is to set up a page at Outpost Earth, a listing of blogs that can be categorized by country, city, subject etc. I have found some interesting visitors from Outpost Earth as well.