On paper, Evernote sounds fairly mundane. An information organizer, woo-hoo. Then, after you use it for a while, you cannot imagine how you functioned without it.
For example, I use the service to preserve and organize things like recipes, instruction manuals, home-repair records, and receipts for major purchases. Most of these items were "clipped" from Web pages using the Evernote plug-in for my browser, though that process has always been a little clunky. The Evernote "clipper" basically just sucked up whatever page I was viewing, giving me few options besides adding tags.