I love DoubleCommand, because it allows me to use my Unicomp Windows keyboard more naturally. (If Unicomp made a Mac keyboard, I'd be all over it.) But DC seems to just kill Leopard. Leo's got problems enough on its own without an attempted install of the latest DC causing an instant kernel panic.
Too bad, I'm going to miss being able to tell my reluctant G5 that Alt is Command and Windows is option.
I guess I'll try again in a few versions, but for now, DC + Leo = poison that hurts you bad.
(Update: I just found out about Keyboard Preferences | Modifier Keys. At least I can remap "option" to command, and "command" to option.)