what tools you've been using to reach the market? and effectiveness of each tool?

@ Hien Duy, well it's not necessary to tell specific product, it may be a service, a consuming product, or a tech product... but there're always principles and experiences which a person can share. you don't need to answer the questions if you don't want to.

@Luu Truc, asking means learning from others. Reading books, anyone can read but everyone can have some different points. Again, it's my questions, if someone doesn't like to answer, I don't bother. so please stay away from my room if you don't want to. You won't see it necessary at first but later you'll find more help answers from different seniors. My advice: ready to listen, slow to speak and slow down your anger. That helps you a lot.

@Luu Truc. I do care for all necessary and willing answers and respect all the answer. Did you ever see that I oppose anyone yet? with harsh words? Please stop talking about this. waste time for all.

The best and cheapest tool is word of mouth. If you have a good product and the service is the best, then people will Talk to others and spread like a virus. You can read Seth Godin, the ideavirus downloadable for free. But it takes time! It is free because it is your product and your service that is so good that people become your ambassadors. most Ipad user boast how great is the machine, the word of mouth spread.

Then you need to read the 200 guerrilla marketing weapons by Jay Conrad Levinson, Guerrilla Marketing. And then you will know the tools, now you need to master the tools with technique and knowledge, know-how and experience! Imagine you and Bruce Lee have have the same nunchaku in your hands, who wins? There is no short cut, if you have a weapon and know how to use it, it is both effective and get you results more than other rookie.

Learn the marketing weapon then use it, you will get result. I use bulk emailing and get 5% conversion, fake Viagra use millions of spam and get 0,001% so give brain into the tool. No shortcut to success

@Pascal Ho Ba Dam, big thanks. that's what I'd love to hear. Welcome more helpful and constructive comments.