Spotlight Comments is a script that uses a combination of Spotlight comments and folder actions to allow users to use custom tags with saved searches, and also to automatically tag files placed in certain folders--e.g. downloads--so that they can be found quickly later. For instance, let's say you're keeping a project for work in a folder, but you're moving bits and pieces back and forth on disk and via email. Maybe (hopefully!) you've made a couple of backups. Eventually, you want to track everything down. With Spotlight Comments, you can use tag the files, and then search for just the tag, rather than trying to come up with search criteria to match only the files from the project. Better yet, you can attach an action to the main project folder that automatically tags any file placed in it, so that you can find the files later, no matter where they've gotten off to.