I realize Leopard has been out for ages, but I'm just now starting to consider making the change. I'm on a 1.8 GHz G5, 768 MB DDR SDRAM, 64 MB GeForce FX graphics card, and 150 GB HD... A good system from 2004. I bought it near the end of the Panther days, upgraded to Tiger shortly after and I've been running fairly smoothly since then. My two main concerns: 1. Speed -- Will the system requirements mentioned above be enough to get a fairly enjoyable experience out of Leopard or will it run all the new features unbearably slow? 2. Applications -- I do most of my work using some fairly old software in Microsoft Office 2004 and Adobe Photoshop CS(1); I also play two games on occasion (as in once every couple of months or so) in Nascar 2003 and SimCity 4 Rush Hour. Otherwise, the two apps I use the most are Safari and Adium and I know they won't be a problem on Leopard. Will Leopard run them alright or do I have to buy upgrade software or something? I think the two games were discontinued awhile ago, at least for the Mac they were. Thanks for the advice ahead of time. Hopefully there is somebody here with a similar hardware/software situation as myself.