OS X note app

I was wondering if anyone knows of an OS X app that I can unobtrusively take notes on. I don’t want to use stickies cause well… it’s obtrusive. The ideal app would be similar in functionality to visor ( http://docs.blacktree.com/visor/visor or http://code.google.com/p/blacktree-visor/ ). Something that with a hotkey that doesn’t take up a whole screen (like expose does) just pops up, so I can take quick notes, and then easily goes away. It would also be nice if it had read/write functionality to it. Any takers? :lol: