The definition that wikipedia gives to web 2.0 goes like that: “An improved form of the World Wide Web Advocates of the concept suggest that technologies such as weblogs, social bookmarking, wikis, podcasts, RSS Feeds (and other forms of many-to-many publishing), social software, Web APIs, Web standards and online Web services imply a significant change [...]

Seth Godin has a good little post over on his blog entitled How to get traffic for your blog.
I have read is article and i think it worth sharing on this blog, in his article he have some good ideas of blog traffic building.
try it