Gugulethu... I think part of the reason for the rush of traffic is because people (spammers) love to leave comments on dofollow blogs. I use the CommentLuv plugin on my blog, and I know that some of my traffic comes as a result of spammers wanting the dofollow link and the benefit of CommentLuv.

Andre... My 8 month old blog is dofollow and a little more than 50% of my traffic comes from Google. I don't even even stress over keywords and SEO, but my blog still shows up in the top 10 for dozens of keywords.