Apple discontinued the PowerBook G4, along with the iBook in the
year 2006. This was the end of the entire PowerBook line. The
PowerBook G4 was succeeded in the same year by the MacBook.
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One can read reviews about the PowerBook G4 from several
different places. Some of the places in which one can read reviews
about the PowerBook G4 are: Amazon, and Notebook Review.
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You can purchase RAM for a Powerbook G4 online from the Amazon
website. Once on the page, type "Powerbook G4 Memory" into the
search field at the top of the page and press enter to bring up the
products.