I've always been a big fan of the PowerPC architecture, and I was really bummed out when Apple decided to go with Intel. But new POWER7 is a MONSTER! It's got 4 , 6, or 8 cores, and each core can handle 4 thread simultaneously ... Mmmmm 32 simultaneous threads per processor. Only 1.2 Billion transistors in the 8 core chip, too. Beats the pants of Intel's Tukwilla.
Now, if I only had roughly $34,000 so I could get a machine form IBM just to play with.
Here's some more info: