Submitting your media releases on line can increase visibility. There are free services and paid services.
There are pros and cons to both. Some people say the free services are not worth the effort, while others swear by them.
Others say the paid services are to expensive, while others say they would not consider not using them.
As with anything, there are pros and cons to both.
Here is a list of sites (some free, some paid)
http://www.prweb.com (no longer free)
Here is a paid service I use. (ExpertClick) I have been very happy with the customer service and the results I am getting from my media releases posted with Expert Click. The service is $995 which includes 52 media release postings. Check out the link below and receive an additional $100 off the regular price.
The Street Smarts Marketer