If you have good ad placement, good content and targeted traffic you can have a CTR of 8%-10% + an EPC of $0.5-$1. Put your monthly visitors into this formula, and you will have your earnings. These stats are from my own achievements.
just decide yourself by visiting this blog.. http://labnol.blogspot.com/2006/07/how-much-money-do-i-make-from-adsense.html
In theory, ab log should be no different to a sit. It would matter on the topics covered and more importnatly, the amount of traffic it gets.
It depends on how much work you put in your blog...of course one can earn quite a lot money from adsense....I am recording about my progress in my blog...have a look..
My advice is . First make a good layout. A good layout is always attracting but a default layout looks clean and could be attractive too. Anyways, start writing good posts NOT to long and NOT to short. Unless you are a GREAT writer Add Tags to del.icio.us, blogger, digg and so on. Remember to PING your blog after every update. Then start making some link exchanges or even better start an contest. Like Link to me and win. I did, got decent links for a cheap price When you reach about 300 daily visitors put up adsense and a small box. Much ads is never popular. Good luck mate Hope this helped you.
I have been blogging since the last month and Ive already made $125 from adsense only. I am currently using blogger.
Try to use blogger. Google is giving more preference to blogger blogs in its search results. This is from my personal experience. 90% OF MY TRAFFIC IS FROM GOOGLE.