TextExpander snippet site

The name sounded interesting, so I visited the site, but I have no clue what it's for. I noticed, in order:

1. A Cory Doctorow quote about killing noobs. I'm a noob.

2. Ten blog entries to help me learn to use the site. I still don't know what it is.

3. Only a few of those ten are actually linked.

4. The first blog entry still doesn't tell me why I'm supposed to be wading through all this...