iLife is separate to the OS, except for on the DVDs that come with new Macs that contain the OS and all the bundled software. Wouldn't the easiest thing be to install iLife from your Mini's discs after installing Leopard, rather than trying to copy the existing installation of the apps - I think you can install iLife without installing the OS on the discs, isn't there an "install bundled software only" option, or a way you can start the installation but then deselect everything except iLife?
If you do want to copy the apps then be aware that some of them have everything in the .app (preferences should be recreated when you run them for the first time), but some eg GarageBand put a lot of stuff in other places, I think it's /Library/Application Support/GarageBand.
Also, will iLife '05 definitely be 100% compatible with Leopard? I doubt that Apple bother to test something that old (in Apple terms
) with it and they don't update '05 any more - you might be better off finding a copy of '08 instead.
A clean installation is definitely a better choice than an upgrade though.
If you do want to copy the apps then be aware that some of them have everything in the .app (preferences should be recreated when you run them for the first time), but some eg GarageBand put a lot of stuff in other places, I think it's /Library/Application Support/GarageBand.
Also, will iLife '05 definitely be 100% compatible with Leopard? I doubt that Apple bother to test something that old (in Apple terms
) with it and they don't update '05 any more - you might be better off finding a copy of '08 instead.A clean installation is definitely a better choice than an upgrade though.