i want Leopard so bad, believe me! all the videos and some of the 300+ features do rock and have made me want it as much as the next mac owner, but... i have a powerbook g4 1.67 with 2BG ram i know the OS itself will probably run pretty well on my machine. and i don't really care about photo booth, front row and so on. i do however care about the DVD player, that needs a 1.6 processor. does that mean that dvds on my mac will take up all the processing power? will i have to quit all apps just to play a DVD? and what about the "eye candy", meaning stacks and spring popping folders and so on, will that slow down because of my machine or what? my most important concern, as i'd hope other peoples' as well, is that i use several apps for my work that can at times take up processor power, ie Photoshop, Fireworks (even iPhoto08 is a hog when you have lots of photos). i understand that my machine is old and i don't demand peak performance from it when running these apps, but i've come to terms with the fact that it will take a little bit longer to finish my work. will these apps slow down even more with Leopard installed? that would be unacceptable for me... and will all the apps we now have work with Leopard? i don't really want to pay for Leopard and do a clean install only to realise my machine can't really take it and clean install Tiger all over again, followed by the hours the updates are going to take.