The reason their stock is so high is because they just released the Intel based line of computers. You will see their stock lower and level out in the near future. As for now, this product has been widely anticipated and therefore, their stock prices reflect it.

Don't cash out your savings and put it into Apple stock because it would be a poor decision. You will see the PC market overtake Apple once the excitement of this Intel based computer fades. Apple always was and still is, a niche market computer that will never overtake the marketshare of the PC.