You should always have a notebook handy for those spontaneous fits of inspiration. After all, writing is not only what we do, it's how we remember things (it wasn't always this way, check out this article about someone training for the Memory Olympics). But when we get back to our work areas, we sometimes need more than dead trees and ink to keep us creating.
These posts take you beyond Word into other applications and software (free!) that help you manage your creative day. Thanks to Tony Eldridge for the compilations!