Email marketing is without any doubt the best ever way to do marketing while making money.
Noah Kagan has been able to grow a list of over 50,000 emails in 5 months, something awesome and that today you can try to replicate. What he did was growing:
1) Grow Mint.com From 0 to 100,000 Users
2) Build AppSumo Into a 8-Figure Business
3) Turn His Personal Blog Into a 300,000 Page Views Per Month Machine.

This incredible, and on video he shows the real secrets behind this astonishing success. And I recommend you to take notes while he speaks!