I Wonder How I Landed On Google Page 2 For My Keyword. Can Anyone Tell Me How??

Hi guyz, I have a puzzle to solve in which i may need your opinion. Last day when i checked my google analytics ststistics for one of my blog, i noticed that google has sent me some visitors. The strange thing is, the blog has just two posts and i never did some extreme marketing for it. you can check it out yourself. See my signature for 101 spiritual ebook. I mean there is nothing fancy about it. I just made this blog to giveaway an ebook that contains links to some 101 self improvement ebooks. there are two posts in total, one is for that ebook, and the other one has a link to one of my other blog.
You can check it yourself, go to google and insert the keyword "free self help improvement e books". You will see my blog on #12.

Now i dont understand how this happened. There is no good content on the blog, just two posts and i never did quite marketing for it. I just started a thread in this fourm in mind warrior section. Used some traffic exchange and thats it. A total of 357 visits and its about a month old.

Now, can anyone tell me how i got on page two of google. Coz i want the same to happen to my other blogs. The one i tried to promote the most is not even in first 50 pages of google, The forex niche based in my sig, And this one landed on page 2. Please do give your opinion.