How much money can your blog make?

If you have a blog or a website and wonder how much Google Adsense can make for you, then you can check out this website called Adsensemeter. Well, the numbers are not accurate since it is based on the Alexa traffic ratings which in itself is not accurate. But it is a nice way to measure up yourself against others. For example check this:
Myspace.com can make around 16 million USD a month
PayPerPost can make $85365 a month!! wow..