I thought it'd be really cool to select text on a web page and then copy it as HTML. This could be my first ever foray into the glamorous world of developing Firefox Add-ons! The plaudits and the accolades are mine for the taking when I make a nifty, useful little add-on such as this.
But somebody already has.
Our resident web designer and photographer Neil had a similar experience with "light orbs", where you take a long exposure photograph of swinging LEDs on a cable. He'd been meaning to make them for years. Now everyone and their cat is doing it. Apparently.
The moral of the story? If you think, do it. Or forget it.