Blog promotion can be done in many ways. One way to promote your blog for free is to use ping service. Ping service is used to inform the different search engines that your blog has updated. My personal favorite is Ping-O-Matic!. It will ping to the technocrati, weblogs and other. Check Ping-O-Matic! service at their site.

Other ping services that you could utilize:

Ping My Blog

KPing