Apple's new 2010 Mac mini is wider (7.7 inches square, just like the existing Apple TV) but significantly thinner (just 1.4 inches thick) and easier to take apart than previous models. A teardown ...
When it comes time to get a new Mac, you have three options: Trade in your old Mac, sell it, or hold onto it. Macs tend to maintain a good amount of value but some Macs are more in demand than others.