> what do you think about the PowerEN?

In the context of mobile (read: netbooks/notebooks) or desktop computing I don't find it that much interesting because it seems to lack in on-chip peripheral controllers: there's apparently just (as much as four) 10GbE and only two PCIe (Gen2) lanes, nothing more. See this presentation from August/September:

http://www.power.org/events/POWERWEBINAR082010/IBM_final_powerorg_2010Aug31_-_Gene.pdf