Our procedure is basically as follows:
1. Install 2.5
2. Update 2.5 with all the live updates from the internet
3. Create a Win PE boot CD using the boot wizard with no user files added
4. Use the Win PE boot CD on the target machine to create an image on a new blank DVD which will contain only the image -- note that if the image is too big (probably this means too big to fit on the DVD along with Win PE but it's hard to tell for sure) then the final burn to a PE image DVD won't work.
5. Go back to the machine that has 2.5 and copy the image files from the DVD to the 2.5 computer
6. Run the boot wizard again and this time use the files from the DVD as supplementary user files on the boot disk and use a blank DVD instead of a blank CD
7. The result is a DVD with PE and the image which can function as a software delivery disk.
It does work, but if you have the unpatched 2.5 or if the image is too big you'll just get a cryptic error message about not being able to write the disk. This should really work better but it does work. Send me an email if you have further questions.