A friend recently told me, a lot of people who consider to start a blog do not, because they assume most other people already know what they have to say.
Far be it from me to show any such modesty - but it's a good point.
So, to get things rolling and get used to blogging,
I'll start with the essentials - links, reference material, comments, etc. - and try and build it up to full-fledged technical articles. Baby steps, as they say.