Once you start using Evernote, you just can't stop. The more you pour into it the more useful it becomes.
It's essentially a note-taking application that works fine on your computer, the web, mobile phones... and that's the thing. It works everywhere. And the crazy thing is that you can add anything to it.
Scribbled down a note on a post-it? Just photograph it with your phone and it get's uploaded and transcribed automatically so that you can actually search your handwritten notes. A-M-A-Z-I-N-G.
Found som useful information, or a funny picture on a website that you'd like to reference later? Just clip it with the multitude of evernote-tools that are out there. A-M-A-Z-I-N-G.
Don't remember what you said that last meeting? Take notes directly into evernote using one of the desktop apps and it becomes instantly accessible where ever you are. A-M-A-Z-I-N-G.
After a few months of using evernote it really becomes your external brain and the fact that you can carry it around in your pocket makes it just so much more powerful.