My system is a PowerMac G5 PPC Dual 1.8 GHz, 6 GB RAM, ATI Radeon X800 XT, Dual 160GB HD RAID, 23" Cinema Display. I am currently running Tiger 10.4.11 and my most commonly used applications are: - Quicken 2007 - World Of Warcraft - Microsoft Office 2004 - Vuze (BitTorrent) - iLife '06 - Adobe CS2 I don't have a "need" to upgrade to Leopard, but I would like to know if there is any benefit in doing so. The two benefits I have been able to find are: - Better OpenGL support (which improves WoW gaming experience) - Support for Java 1.6 (which helps Java development and potentially some browsers) The main disadvantages include upgrading some applications (at least iLife '09, and perhaps Microsoft Office 2008 and Adobe CS3), and some potential decrease in performance. Are there any benefits that people can think of? Or should I just stay with Tiger? Thanks!