Flickr and editing the title of photos
Even better is the way they draw your attention to this feature: When you mouse over the title or description of one of your own photos, the background color is highlighted in a light yellow, alerting you that something’s up.
But, even better, the yellow color stays for about a second or two after you’ve left the title. This is what clued me in to the fact that it’s not just the usual :hover effect, something special is up here.
To make things complete unambigious, they also say in italics “click here to add a description” when you haven’t yet, and they have a tooltip that says “click to edit” (which, btw, doesn’t show up when the “click here to add …” text is already showing).
All in all, a simple and brilliant piece of work. Kudos.