Well here's one use for a blog:

One use Scoble has for blogging:

I use this weblog for a variety of purposes, but lately it's just to keep track of useful stuff on the Internet that I might want to look at later. Believe it or not, I use Google to find links that I've put on my weblog in the past. For instance, when I need plumbing supplies, I just search Google for "scoble plumbing supply" and up comes my weblog where I talked about a plumbing supply place.

I was recently suprised when I googled for an answer to a .NET question and one of my own posts was the first hit. I don't know whether I was more amused by this or annoyed at having forgotten the answer to the question and that I had posted it.

There it is - search Google for your own commentary. I have to admit, I've done the same....