The Internet is a great tool for communicating directly with your target audiences at mimimum cost. PR agencies are are finally starting to use this new instrument for public relations purposes.
For a complete study on how journalists behave on the net, see the Middleberg Ross Media in Cyberspace study, a national survey on media behavior.
Books
"Effective PR on the Internet" by Babette Schmitt was written primarily for public relations practitioners who want to apply their strategies and tactics to the Internet. The authors have also put up a website about the topic, Connecting Online.
Tips
When you start working on a site of your own and want to
get some initial traffic to it, it is obvious to any Internet
savvy webmaster that you need to register the page in search
engines and registers. But before you run off doing this, take
a few minutes to prepare a list of sites that you register
with. Try making it as a table with the most important data. You will appreciate it later when you check your listings and
the sites where your listing has not appeared.