When it's been months since your last blog update, you really don't know where to start. This can cause more blog apathy as you find it daunting to put everything that's happened in that timespan into a few short paragraphs. I think the best thing to do is to not bother and move on.
I started a 5 year Journal last month. Each date is divided into 5 sections. The idea is to write a few lines each day on the same date every year. It'll be cool to see your thoughts on that date over five years. I found a set of questions you can answer each day.
Lets see how long I can keep this going.