One good way to keep making money on the internet is to tend to your most popular posts.
Whether it's a popular post that makes you Adsense money from the traffic, or affiliate money from the product pitched within, take advantage of all the eyeballs by giving them what they want.
Take time to go back to posts and update them with new data -- I did that a lot today on my TV site.
Or, if you're rushing to go pick up your kid from school -- hint, hint -- just take enough time to pretty up your money-making post and republish with a current date.
That way, readers don't feel like their reading old news...