How to archive software that's bundled with Macs?

[M A V I C]

So after erasing my OS X partition the other day, I'm reinstalling. I would like to keep the install as light as possible. I installed from a 10.5.0 retail disc. Now I am installing the bundled software that came with the machine. If I choose not to install GarageBand & iDVD, I save nearly 7GB of space with their associated files (sounds 'n stuff.) I would like to archive these installers online so if I'm on the road and I want them I can download them.

I've browsed the install DVD and can't figure out how to grab the installers for individual apps. Anyone know of a way to do this?