europeforvisitors - 3:32 pm on Aug 18, 2006 (gmt 0)

80/20 or whatever the ratio is, you can't predict which 20% is it going to be that will make you the money.

It depends. If I were to let AdSense channels dictate my editorial coverage, I could make some highly educated guesses about what to write. And even without channels, I can be fairly certain (for example) that an article about airport transportation in London or river cruising on the Rhine will get more traffic--and earn a higher eCPM from AdSense--than an article about reindeer-watching in the Norwegian Arctic.

Still, surprises do happen, and it's always satisfying when a story about an esoteric subject turns out to be popular and profitable day after day, month after month, year after year.