The sucking sound of it pulling air in through the draft.
The pings and ticks letting me know when things are heating up.
The smell when I don't pay close enough attention to the first too and things got a bit hotter than I like
The shadows the smoke casts on the ground as you're scraping ice off the walkway, and you look up to see the odd color smoke...just as your niece comes out to tell you the stove is really hot and you realize you're seconds away from a chimney fire
The sounds of boiling creosote, and the sounds of the falling, dried-out creosote sloughing off the chimney walls as you stand there with the dampers shut tight letting the chimney cool off from a near fire.
Oh yeah, lots of information when you pay attention.
We're regular log-whisperers here. Sometimes the logs even talk back.