I earn 90$-100$ per month and I'm mainly getting my earning by writing at revenue sharing program Hubpages. (see my sig)
I have about 1K impressions on my blog which brings me about $5 daily through adsense.. Good, But i still need to work on it!
Keep writing Quality Content, Promote it through social Bookmarking websites, Forums and Comments. ALso Make your blog seo Friendly. You will surely see a increase in your traffic!