If you are here because you are trying to optimize your company online, then you have found a great secret method. Thankfully PRLog has not allowed itself to be abused to much, so did not fall that much under Panda, Venice, and Penguin.
I love it, because for a local client, the NAP is showing (name, address, and phone), which creates a citation. For back links, you can insert at least one into the release itself, and then you have a website that is noted in the about section.
For your other use, you might like the post I did today at http://bit.ly/GoogleLocalPR. This is an article on the top ten ways to get high rankings on Google Places and Google+ Local.