I believe anyone can sell from their blog. Selling products (like WordPress SEO Secrets) or services (like Blog Consulting) from your blog will make you far more money than AdSense. In order to sell from your blog you need a few chief components:

• Expertise, experience, and talent in a subject worth paying for (and if you don’t have that, what the heck are you blogging about?).
• A way to receive money online (PayPal, essentially).
• A way to facilitate digital product downloads, for which I recommend E-Junkie.

If you want to learn more and get an overall picture of how to generate mutliple online income streams through your blog, then I recommend the Online Business School information product from IttyBiz. Here is an Online Business School review post I wrote a few months ago.

The purpose of nearly any information product you could sell is to teach people something at which you are an expert. Knowing your subject matter and being able to market it and teach it effectively are not even remotely related. The program responsible for arming me with the very profitable knowledge on how to do this is Brian Clark’s Teaching Sells, which is reopening soon.

This is not very technical stuff, here. If you can copy and paste HTML code and write a document longer than 30 pages or so, you can do this.