I like to linger around bloggers communities, read others' blogs, leave comment and ask question to enhance my blogging knowledge. I firmly believe that blogging communities are very effective avenues to get visitors to blogs.
I used to get good traffic from mybloglog.com owned by Yahoo! but now closed. I really miss mybloglog.com Since then, I started looking at other such bloggers community and compiled a short list.
http://www.blokube.com/ (more of a social voting site similar to social bookmarking)
I hope you would find them useful. Please add to the list whenever you come across another site.
As a matter of fact, please share any other way to promote blogs (links to sites only please with a sentence of description). It would help the overall blogosphere wanderers.