I'm eagerly waiting till Macworld in mid January before upgrading my old G3 Mac
My 12" Powerbook G4's logic board died recently, and I replaced it with a Macbook. I don't like the Macbook's chicklet keyboard. I'm hoping Apple comes out with another sub-notebook laptop in January, or else I will probably sell my new Macbook and get a Macbook Pro with a real keyboard. I think the chicklet keyboard was a bad design choice.
I tried Leopard, but its X11 is hopelessly broken, so I'm sticking with Tiger. Most normal people don't use X11, but I do, and I need a version that works.
I miss my 12" Powerbook G4. It was a great machine. I'm a little annoyed that the logic board went kaput after only 3 years.