Skinny, the basics
However, in this case you have to be cautious because these blog directories are getting populous very quickly and you can get benefit by submitting your blogs just after producing them. Basically the popularity of any blog depends upon its search engine rank. Even a search engine does not surf each page of blog directory when the user puts a request. Analyzing the traffic of the blogs directories is another good option to know about its popularity. If you do not consider this thing then you may end up with no benefit.