It's been almost a year now since the release of Leopard and I've been contemplating an upgrade. I use Tiger on my 17" Powerbook G4, and now that nearly a year has passed I'm wondering if now might be a good time to step up to Leopard. I think I'd make use of most of the touted features, especially Time Machine as I have no method of backup currently in place. My big concern is are there any reasons not to do it? Having never installed before, if I choose to upgrade, will I have to re-install all my old apps like Final Cut Pro and AfterEffects or can I upgrade without having to dig out all my old install discs and set aside an entire day just to make the transition? It seems like either "Upgrade" or "Archive and Install" are the way to go, but I'm just not sure which to choose. Also, I only have about 11GB of space left on my hard drive, so will that be enough room or would I have to use my external drive somewhere in the install process? Thanks so much.