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 ...
From the start, iFixit praises how easy the Mac mini is to disassemble despite having a much more compact design. The bottom plate is held on by clips that can be detached without causing any damage.