I have been meaning to link this, from Anirudh, Why I maintain a weblog. It’s a wonderful piece of succinct writing, and I agree with its sentiments. Here’s an excerpt:

The most beautiful part, as I now realize, is to be able to look back on yourself, like a time capsule. For some reason, I have a very very weak memory. I frequenty encounter things that I did not fully remember doing (for example, I found out I own ninjagod.com ), and it feels nice to remember what I felt during certain periods of time.

But the most important thing is this:
My main goal in life is to grow and change for the better. And this weblog seems to be physical proof that I have.

Read the whole thing.