what criteria on what to blog about and what not to?

Following a post I made earlier this year, someone made the comment "what criteria do you use to decide on what to blog about and what not to?". So what is/are your criteria?

Well, where has he been?

Have been lazy about this over recent months, but also find that I'm perhaps not quite as bothered as I used to be. Whether that has anything to do with my being unemployed catching up with me and quenching my motivation, or whether it has more to do with my increased 'workload' with Tools With A Mission, I'm not sure.