This isn't my blog, but I came across it yesterday: shootmyblog.blogspot.com
Interesting concept... it gets viewers involved while promoting the blog itself... at the same time, if the viewer participates, he/she gets a linkback to his/her site.
Interesting, fun and simple. I came across it while browing IT Toolbox blogs, so this idea has already created a buzz.
It's important to offer your audience something they can't get anywhere else - innovative ideas will go far.
Also, there are such tools as trailfire.com or bookmarking sites such as blue.us and delicious that can be used to generate traffic.