Blog posts which bring in organic traffic. Listing on the Chrome Web store. Asking friends and friends of friends. Asking former colleagues. Participating o

Blog posts which bring in organic traffic. Listing on the Chrome Web store. Asking friends and friends of friends. Asking former colleagues. Participating on relevant forums just answering people's questions, NOT pitching your product. Tweeting product updates. Using Olark to stalk visitors. Emailing 3-5 popular, connected and intelligent strangers everyday to get feedback. Writing a book. Cross promoting and selling other popular products in the field to get to know customers.