Windows only, but still pretty sweet. This little bit of freeware, aptly called Easy Email Extractor, allows you to extract email addresses from files, folders and URLs. Point it at your hard disk and you will get every email address on there! The program allows you to add a button to the SendTo menu and exclude emails that contain specific words. Just great for finding long, “lost” email addresses on your storage systems.
H/T to Lifehacker.