I recently did a clean reinstall of OS X on my MBP (first generation before multi-touch) using the disk that came with the computer. Now I have iDVD, iPhoto and GarageBand, but I'm missing iMovie and iWeb.
Well try putting in disk 1 and seeing if it has bundled software. If not then put in disk 2. All Mac's come with iLife these days so it's safe to assume it's on one of those disks...