I think thats correct: 7 x 12 = 84 - 4 (hours of lunch time for 7 days) ;P

Make your own blog, present yourself, write about your product. Or if it takes too much time, just write an article about your software. Or may be just go to stackoverflow (or similar), look for people which have same issues as you had when you decided to implement your software and try to show them your solution.

Exactly! I have never developed own produkt/software to sell it. But if I would once do it, I will do it as you suggest ;)