Well I have my own personal lesson on how to increase traffic to your blog, and I'll even give it out for free. The answer is: POLITICS. My evidence ?
This picture is a snapshot of my traffic over the past one month: visits in green, and page hits in purple. The prefix is my average traffic per day: not a lot, but then how many geometers are there to begin with ? The climb starts the day I posted my article about election cartograms. It lasted for a week, and I am still seeing the effects of it.