I was just poking around in the Services menu on MacOSX, and stumbled across the "Summarize" service. I'd seen it before, but never fired it up to see what it did.
What you can do is select any text in a Cocoa application, then hit the "Summarize" service. It will launch a mini app that will generate a summary of the selected text. You can even drag a slider widget to control the size of the summary (from complete, to very short). Extremely cool.
The abstract for this article was generated by the summarize service, on the body text of this article. It would be cool if iBlog could automatically fire off the contents of an entry to this service and transparently populate the Abstract field....