I have never made a blog before, or a diary for that matter, but I think that recollecting thoughts and experiences is definitely good for inspiration. I doubt many people actually read blogs, but even so I think it is great that people all over the world can share their thoughts opinions.
I will try to be as open and honest as I can, mostly for myself, but also because I might be able to contribute things that I might not think of at the time or not have the intrepidety to say out aloud. Also there is so much bullcrap on the internet, I think it would be quite original to actually say what I think.