Setting up a blog is a convenient way to keep a diary that you can load with more pictures than you would care to post in a forum. Can be as simple or as complex as you care to do it with the choices of templates.
Toyed with Blogspot for my Belhaven build: http://belhaven30.blogspot.com/ but it does take some effort to keep it updated, taking up some of the precious build time. Sometimes though maintaining the blog can give you that small kick in the butt to keep you going when construction fatigue and enervation creeps in especially when doing a big project.