I've been holding off actually purchasing Leopard for my mac pro. I've been using Leopard from a different Mac Pro... yes I know... but I was waiting for a 10.5.2 or greater retail so when want to rebuild my machine I won't have to swap back to my dieing 1900 or 7300. Well today I stopped by my apple store and bought a family pack retail Leopard 10.5.4. The box has a small purple sticker that says "New Version 10.5.4". I haven't tried booting it yet my Mac Pro with the 8800 GT yet but I will be trying shortly. So this should be a good solution for all of us who have the 8800 GT but find we can no longer reload our machines without putting in an old card. Now I can finally rebuild my Mac onto these two new WD 640GB HD's (setup in a raid 0 stripe). For all of you who already have Leopard and bought the 8800 GT, maybe you can call Apple and ask for newer pressed 10.5.4 DVD's to be shipped to you, but I wouldn't hold my breath. That's why I waited.