Last week, I came across an interesting site that pays you to make posts about their advertisers' products on your blog.
Pay Per Post Site
The conditions are:
Your blog must be at least 90 days old, have at least 20 posts in the last 90 days, and the last post made must be recent (in the last week). If your blog meets these conditions, check out the site. The posts you make about the products are fairly short, and you can sandwich your regular posts around the product posts.