Load Disc 1 of your system DVD to the desktop, open the disc and there should be a "Install Bundled Software" icon which has all the additional stuff..
However, if it's a retail copy of Leopard you won't find iPhoto on there as it's part of iLife.
Those apps are free on the restore disks that came with the computer. Because they were free when you bought the computer, a Leopard or Tiger store bought disk won't have them, you are just buying the OS.