hi there, im new to macrumors forums and new to mac. ive just bought myself a second hand mac mini 1.25ghz powerpc g4 with 256mb ddr sdram running mac os x 10.3.9 just to see if i can get on with a mac before i buy a macbook or something similar. The reason ive bought the mac is because ive got an iphone and wanted to link the two together and ideally try to build an application on the mac to run on my iphone but as ive found out i need the latest os x 10.5.4 or .5 to run the sdk therefore my questions are these... 1. can i upgrade from 10.3.9 panther to 10.5.4 or .5 leopard? 2. what do i need for this, does it have to be done from a cd? 3. will i need to upgrade my ram in the mini mac from the standard 256mb as i read on the apple website that minimum requirements are 512mb or is this abit overkill? many thanks in advance for any help, mike!