Internet Machines
The finger protocol allows people to check vending machines over the internet to see if they have anything left in them. So here's someone that collects links to online Coke machines.
A bit of history - the world's first web cam (and online camera for that matter) and FishCam, from the day when Netscape was still Mosaic Communications.
But the best of all is the remotely controlled (through the web) Etch-A-Sketch.
Let's not forget the SpudServer, which joins the ranks of the SlugBot as one of the weirder inventions: a webserver powered by potatoes.