Software :: What Software Handles Multi-threading?

So everybody's got a Core2 Duo, or even a quad core or octo core machine these days, right? But what for? Because how many, and which, apps can actually take advantage of multi core processing? Can you list them? I can't. And afaik there are pitifully few applications coded for multi threading. That's borne out if you have a look at a temperature widget for your machine. It will show you the temp in your cores, and you may notice that one core is nicely at working temperature while the other(s) is/are considerably lower temperatures. That's because they're not doing anything! They're hardly ever called upon. They're literally not breaking a sweat. Practically everything is processed by just one core!

So IRL multicore processors are waaay overkill for 99% of people's requirements! Yet we all paid for them...