Didn't think about that one? Write it, and they will come? Not necessarily. I have seen nice projects where authors make little extra effort to get the word out, and it shows. With the Internet, effective promotion can be accomplished without much effort or expense. And very soon your project can rise very high in search engine rankings.
Subsection1.4.1(*) Social Media
Subsection1.4.2(*) Reference Sites
Subsection1.4.4(*) Discussion Groups