It's a really simple website which you can bookmark and go back to whenever you want, to paste or jot down any random notes you might want to whilst browsing the web.
Buno - Simple Note Taking - Simple, minimal & easy note-taking
A5 - Takes notes in your browser. Elegant & simple.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Falcon for iOS - Writing notes made simple
Notational Velocity - Notational Velocity: modeless, mouseless Mac OS X note-taking application
Chars - Unicode Symbols Keyboard for iOS