Firstly a special thank you goes out to Dana_W of the warrior forum who created and updated the original list.
Press release sites can be used to promote just about anything but these sites work best when you have something really good to shout about perhaps your new website, product or service?
Just visit each site and enter your details, try to provide as much information as possible because we all know how much Google loves content but it also allows people to get their first insight into your website.