There are rumors of a new Macbook coming out in September (Macworld issue 10/2008) It probably will have an aluminum case. I was able to fix my battered ibook G4. It has a new harddrive 160 gig. It seems to be faster as well. I found out now that my internal microphone dosn’t work anymore. I guess the "book" sufferes from old age. So perhaps next year I will go for a new macbook, depending what they get on the market.
For now my battered ibook works and I am happy with it.