Newbie here. I've been hearing about the new Mac OS 10.4 coming out soon. My question is: Is this a situation like a PC user when you buy, say, Windows 2000, and wannt to upgrade to Windows 2000 Professional? I mean do you have to actually pay for the upgrade? The reason I'm asking is because I just bought my PBG4 about 2 months ago, and although everything's updated to the current version of the OS, do you think it's neccesary to upgrade to 10.4, whenever it comes out? What are the benefits of the new system? Again, I'm still pretty new to the mac world, so please go easy on the technical terms!