So, I just upgraded my 15" PB G4 1.33Ghz with new RAM and new HDD. All I can say is, wow. I know it's a given, but it's working so much better and just feels like a new machine. I guess I just needed to get that off my chest. For anyone sitting on the fence who is considering upgrading their machine, go for it. I went from a 60GB Toshiba 4200rpm drive to a Hitachi 100GB 5400rpm - the difference alone there was simply amazing. My goodness, are those 4200rpm drives slow! I also upgraded the RAM from a miniscule 256MB to 1GB from Crucial. Word opens a 30 page document in 2 seconds. I am just astonished. So, go on, upgrade your machine if you want to give it a new lease of life! David P.S. A big thank-you to those who helped me find a compatible HDD in an earlier thread! The MR communtity never ceases to amaze me.