This morning, someone called to ask me for images I'd used in a presentation a year and a half ago. Time was, I would have had to search my hard drive or archived files for the slides, if I'd saved them at all. Now, instead, I've let the web be my filing system, and Google serve as index. I could find the presentation in minutes, and email off a URL in seconds more. With the whole thing under a Creative Commons license, I'd also given the caller an easy set of terms on which to use it.