First $50 day using Blogger!
 

I've two blogs with about 1000 unique visitors a day and these bring in between $10-$25 a day, I've 3 which bring in a steady $3 or so a day with between 100-400 visits and the others sometimes make pennies and sometimes a few dollars.

Getting a blog to make a consistent $1 a day with adsense is a lot tougher than some might think, I've had one blog with 600 or so visits a day make less than a dollar a day when a similar blog with the same traffic and layout was making a lot more... just different content.

One thing I have been doing is trying to predict who/what will become popular i nthe next few months and make a blog about it. Myspace unsigned artists and Amazon advance sales list are a good indicator.
I started the Colbie Caillat blog when she was top of Myspace unsigned. when she got signed and released an album I was in great position in the google searches to take advantage:

Sold lots of her albums and other things people added to the orders as well as some adsense clicks.

Had some blogs running for a few years and some for a few months. I try think of a few ideas every day and usually make a few blogs a week, I end up deleting a lot though if they don't do good.

Nearly all the traffic is from google, I post a few links on forums but I've not paid a cent to get any traffic or for any hosting, domains etc.

Subject wise they vary, some about IT, music, pizzas, parents. I try keep the content static, I don't like writing posts so I usually make the blog, try promote it a bit and see how it does. I maybe make 1 post a day to the blogs which takes 5 minutes (1 post total a day I mean across all blogs)