This page seems to be pretty useful. Shows where Apple Products are within the average product cyles for each line. Neat. Says not to buy a Powerbook now, cause they are overdue for an update. Which I knew. But cool. I plan to replace my powerbook at the end of January with whatever is the best powerbook available at that time. I am hoping for not just a speedbump but a major revision before then. But we shall see.
http://buyersguide.macrumors.com/
This page provides a product summary for each Apple model. The intent is to provide our best recommendations regarding current product cycles, and to provide a summary of currently available rumors for each model.