I've put together a list of free press release sites that others may find useful. As of yesterday, all of these sites offer a free package (as well as several paid versions) for distributing your press release. Now, the free version is not nearly as good as one of the paid packages in terms of exposure and dissemination, but if you can't afford the paid versions (or want to allocate your marketing money somewhere else), these might be of use to you.
Thanks again for providing an excellent list of press release sites. The service you are providing on your site with all the lists is great. Like you the information on my web site is to assist other authors with their marketing efforts and offer marketing information and opportunities.