So recently I bought an iBook G4 1.33 GHz 12" in very good condition with a new genuine Apple battery and two genuine power supplies for € 150, not a bad deal I think. Anyway, it has the stock Toshiba 4200 rpm hard drive and had 512 MB RAM when I purchased it. I've upgraded it to 768 MB RAM afterwards. At the moment it runs Tiger, but I think it's time to move on to Leopard mainly because ClicktoFlash for Tiger does not allow me to play YouTube videos with the QuickTime Player anymore and I can't find an alternative. I've tried Leopard on it and it was not slow, but it felt not "smooth". I think the slow hard drive causes the pretty long app launch times and the sometimes sluggish feel. Is it worth it to upgrade the hard disk to a modern 5400 rpm model, like the Samsung HM160HC? I don't do heavy duty stuff on the iBook, but when I use it I want it to run as fast as possible. Will this hard drive make Leopard run smoother? I also plan on upgrading the memory to 1 GB, I can get a 512 stick from a friend. What are your thoughts, is it a waste of money or will the upgrades make a noticeable difference? I have a retail Leopard dvd, so at least I don't have to buy that.