SixDegress is a $99 OS X app that data-mines your own hard-drive and tries to build links between people, files and folders. Laura Carpenter at the OS X con was talking it up yesterday and it looks way cool — I've just downloaded the demo to play with.
* Locate files with similar names or file revisions, anywhere on your system.
* Show all email threads related to any file or person on your desktop.
* View all the files a person has sent you, regardless of where those files are stored on your computer.
* Create dynamic, self-updating projects.
* Find misfiles or attachments quickly without searching desktop folders.
* Navigate and open any message, file or person on your desktop in one click.
(Thanks, Laura!)