My girlfriend gave me this link:

http://www.prwire.com/

She says for $125 per year, they will send out your info or press releases and it's a way to get your book, topic, job, out to professionals. Her brother uses it (he has a product to sell) and does very well on it.

I believe that if someone needs a speaker or expert on a topic, they will be listed here and it's a good way to get interviews for radio, etc.

Can't say for sure if it really works but thought I'd mention it here.