My blog at http://erica.biz makes more than $1,000/mo in advertising and affiliate commissions.

I built the blog after I bootstrapped and sold my first tech company. I talk a lot about growing your business/startup, and especially about all the failures I had while building my businesses. It became popular (1.2 million unique visitors last year alone.)

I've now been blogging there for just over 6 years. Today I'm more focused on my startup, so my blog isn't bringing in as much income as it used to (though it's still over $1,000/mo.) My best month was over $24,000 in income.