Most of your visitors will be coming because they want to learn a language from a cheat sheet or have a quick reference. This seems like a great target audience for Amazon links. If you had 2-3 books you recommended in the right sidebar for each category, I think that might fare better than Google Ads. Could be worth A/B testing.
The Google Ads are just a placeholder. I think Amazon books would be very relevant, and I am going to look into some other affiliate programs such as thinkgeek.com.
Most of your visitors will be coming because they want to learn a language from a cheat sheet or have a quick reference. This seems like a great target audience for Amazon links. If you had 2-3 books you recommended in the right sidebar for each category, I think that might fare better than Google Ads. Could be worth A/B testing.