Hi JJ,
Adobe provides the "Creative Suite 4 Deployment Toolkit" on CD. It is a wizard that will supress the EULA, progress bar and the serial number on-line registration. It makes an .exe and .xml file for both Install and Uninstall. These are suppose to make the installation silent when deployed. However, I could not get it to work. It would run but not copy the files to the Program Files. Add\Remove programs has it as being installed but there are no shortcuts or exe files.
You might want to check www.appdeploy.com for other recommendations on geting CS4 to install silent.
Adobe does not make it easy.