I have been spending time trying to increase traffics to my blog, and after trying blogexplosion for awhile, decided to try blogclicker (linked on my sidebar).
Blogclicker, like blogexplosion, works on the premise of getting points for your site for every site you visit. But UNLIKE blogexplosion, blogclicker gives you the option of upgrading your membership to increase the surf ratio, and of buying credits if you don't have the time to surf to earn them. Because of this, I tend to like it better, although it seems to have fewer users.
So, feel free to give it a try if you're looking for ways to increase your blog's readership.