We got our first customers from my existing blog / email list - before launching the startup I had been blogging for 2+ years. Second wave came after the first

We got our first customers from my existing blog / email list - before launching the startup I had been blogging for 2+ years. Second wave came after the first mentions on relevant blogs/new media outlets (http://blog.traindom.com/places-where-to-submit-your-startup-for-coverage/ http://blog.traindom.com/places-where-to-submit-your-startup...) Third wave I'd say came from participating in discussions in relevant forums.