Once you have set up a blog, it is easy to add posts. Teachers forget to keep records of how they have grown and continue to grow as professionals, so I find it really easy to post up every few weeks or whenever I feel something important has happened in my teaching and learning space. I can keep a track of my inquiry (teaching standard 2) easily as well, and while your appraiser may not require you to do an inquiry, the teaching council certainly expects that you do.
Blogging is a great way to order thoughts and decode your reflections. As you write or express in a video or audio file, you are focusing on making sense of what you have done.