Yes, I know these aren't the most spectacular upgrades, and the Yonah/Memrom-books are going to be way faster.
But I need a new laptop *now*. My 667 MHz TiBook was damaged a couple of months ago, and is now barely functional. But I couldn't bear to spend $2500 on a Powerbook that was last updated almost a year ago, so I waited. And I'm glad I did. Speed is not my primary concern... the 1.67 GHz G4 will be fast enough for now (although I am disappointed at the lack of the 7448 in this update, I'm sure glad Apple isn't going to be relying on PPC processors for much longer, as it seems like Freescale and IBM have no end of difficulties making improvements to these chips). What I really wanted was a brighter, higher resolution display, a better GPU, dual-layer DVD burners, and a bigger, faster HD. All of these issues have been addressed, so I can't complain.
I placed my order within an hour of the announcement, and I'm eagerly looking forward to the arrival of my second PowerBook.
Cheers