Notational Velocity on the Mac, even if it isn't updated it still quickly stores and organizes (good for rough or final works). I'll use TextEdit or iA Writer if I need to actually work with the note or to publish. Sadly at least once a month I still need to use Office for Mac for something.

I don't personally have a need to save or insert data, images, or other content. If I really need to I'll insert the online URL or the location on my server in the note. Which makes a basic solution the best solution for me.

I also use iA Writer on my iPhone synced with iCloud for on the go access, and writing *nothing personal/private for security, secure notes are encrypted and accessed online or I use a physical air gap between machines I need it on.