I'm not exactly sure what you are asking here.
I you simply want to include some programs on the Vista installation CD for installation execution, just add it to the DVD.
You can rip an ISO of the DVD to your hard drive, then edit the ISO to include the executables and save the new ISO.
Burn the finished product back to a DVD and run the executables individually after the Vista installation. You may be limited to available space on the DVD depending on how many programs you wish to include.
As far as having applications install during the Vista installation, there have not been much success there.
You can slipstream Service Packs and integrate Drivers (DriverPacks.net) but Switchless Installers and WPI add-ons for applications are almost non existent.
Of course you may want to experiment with sysprep as others have done, but there again lies limitations.