I'm running Snow Leopard (10.6) and OnyX told me I need to boot from my install CD and use Disk Utility to repair my drive. (It wasn't any more specific as to what the actual problem was.) I can't find my Snow Leopard disc anywhere, but I've got a 10.5.8 disc here. Will it work too?
(Just to be clear, I'm talking about a filesystem repair, not a permission repair. Repairing permissions with a Disk Utility from an older version of the OS won't work.)