I'm surprised I'm one of only a few who does a custom OEM Windows installation. I use to work at a local computer shop and we created our own OEM installation for the computers we sold. This requires the Windows 98 CD, I'm not sure if the retail version has it since I only have the OEM CD.
1) insert CD into CD-ROM
2) open a MS-DOS prompt
3) change directory to \tools\admin
4) type the following command:
mkcwrt /C:"command.com /C mkcwrt.bat D: C:\Wizard"
and voila the Prinstallation Wizard is installed onto your Hard Drive. Remember to substitute "D:" with your CD-ROM drive letter and "C:\Wizard" if you want to install it into a different directory on your Hard Drive.
5) Goto directory where you install and run "Opkwiz.exe"
Besides being extremely cool to have your own picture or logo displayed everytime you go into System Properties, once you make a custom preinstallation disk you can install Windows entirely without having to choose the component you want installed, etc. Very useful if you reinstall often. I hope that helps.
Cheers,
-LeeBear