Well im debating to upgrade my PPC G4 from Tiger. I'm relatively still new to the MAC world and just curious as to know what would be some improvments jumping to 10.5? I have the 1.67Ghz processor and 2GB of RAM. is there anything i should know performance wise? and lastly, when i go to install, will i lose any of my programs i have installed already? I'm going to do an upgrade install, but i want to be 100% sure to know if ill lose any of my programs in the process. Thanks!