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I have 10.5.2 in a Powerbook G4 (1.33Mhz) and experiencing frequent screen/cursor lock ups. I have to "force quit" and reboot. Happens most often using Safari, but not Photoshop. Did a Disk Utility verification on the internal start up disk, with no issues reported.
Try repairing disk permissions. Also take out any third party RAM that you might have installed, that may be it. Does it only freeze with Safari? If so, maybe you should reinstall the 10.5.2 update.