My PowerBook 12" 1.5G has 100% CPU usage when playing back the new TV program from iTunes store. And sometimes it even choke. While I have no virus scanning software, some programs running such as Opera, iTunes, Entourage and have about 20% CPU usage when idle. So I am VERY curious about this. Why is it so slow on a PowerBook while you can actually play that video on an iPod? Is it the iPod too powerful or it is just because apple did not optimize enough for older Macs (pushing people to new hardware)? I have just ordered a new iMac but I am not happy about my PowerBook which is just one year old. Wish to hear your opinions about this matter. Thanks!