One way of earning money through blogs is to sell them. BankAholic, a blog focusing on banks, finances, insurance and general economy, was recently sold for $15 million dollars. Heck, even a five-month old Malaysian blog can be sold for $10,000. Of course, your blog must actually have some value.
So if you were to sell your blog right now, how much would it be? Here is a link putting a monetary value on your blog by the number of other blogs link to yours.
Which means, I can give mine for free.