The Window Titlebar in Mac OS X Tells You When You Have Unsaved File Changes

Not sure if you have unsaved changes when editing a file in Mac OS X? Just look at the window titlebars close button, if the red close button has a darker red dot inside of it then you have unsaved changes.
I use this frequently as an indicator for when I should quickly hit Command+S but I don’t think it’s widespread knowledge and I was reminded of this by TheMacObserver, who also points out that the little mini-icon next to a filename in the titlebar is an indicator of when a document needs to be saved.
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These just a few of the many subtle things in Mac OS that make the operating system so great.

And most conveniently: The mini-icon can be used to drag the file into dialogues, terminals etc…
No need to find the file in Finder again.
The “mini-icon” is also known as a “proxy icon” for those wanting to do further research on it’s many tricks. In addition to Mathias’ you can also Command click a proxy icon to reveal its folder nesting. BTW nice site!
You do realize that Linux and Windows has this for more than 10 years, do you?