[drodil]

If I understood right you are asking how to get the users without advertisement...(?) I think most important thing is good and easy-to-use product. People should be able to start using the product as easily as possible. If the product is for example website, the registration and start of use should not be more than 3 clicks away.

Next thing is social visibility (for example Facebook, Twitter, blogs etc.). Especially inside look for product development and new upcoming features give the users something to wait for. Also referral programs (discount or some other benefit for people who get friends and family join to use the product) are proven to be very working concept.

Also one thing to consider is to allow people use the product for free for example for 1 month and after that either automatic or manual contact to continue the usage and start paying.

The whole thing depends a lot what kind of product you are talking about. Applications have their own channels where you can get users from for example app reviews done by some bloggers on the internet.