The Summary: Nugget of niceness, or clump of crap?

You know what there needs to be? Some kind of Summary generator. Something that sorts through your story and comes up with a pithy line of text. I don't think I've ever had a single summary that I've been really happy with. There have been a couple stories where I've debated picking ten random words from somewhere in the story and calling it done.

So, open questions for any writers who are bored enough to answer them: How do you come up with your summaries? Are you happy with your summaries? What, in your opinion, makes a good summary?

(Also, gratuitous icon post. I expect to get a lot of use out of this one...)