Well, Moore's law isn't dedicated specifically to the number of transistors on a chip, but more generally that computing speed/power will double every 18 months. Lately, some chip manufacturers have been saying that they've made chips as small and packed as they can right now, so for Moore's law to continue to apply, computing power has to increase some other way, so they're putting more cores in one CPU. The problem with that is that most programs and programmers do not take advantage of multi-core processors (yet).