How to make a DVD of that student-only Windows 7 you bought for $29.99
To start with, make sure your downloaded Windows 7 files (the 'expandedSetup' directory) is unzipped into C:\ -- it'll make things easier later.
1. Download this tool -- alternatively you can obtain the official pack from Microsoft, but that's a whole darn gigabyte.
2. Unzip and move oscdimg.exe to your System32 directory (likely to be C:\Windows\System32)
3. Open an elevated command prompt. In Vista you do this by typing 'cmd' into your 'Start Menu' and hitting ctrl+shift+enter. In XP, just type 'cmd' into the Run dialogue (Windows Key+R or from your Start Menu).
4. Type (or copy and paste) the following into your command prompt (this will vary a little, depending on where you've put your expandedSetup folder):
oscdimg.exe -u2 -b"C:\expandedSetup\boot\etfsboot.com" -h "C:\expandedSetup" C:\WIN7.ISO
5. Ta'da! You've got a burnable ISO!
All you need to finish the job is a good burning application like ImgBurn, CDBurnerXP, or InfraRecorder. For this particular task I'd recommend ImgBurn - then just right click the ISO file and start the burn from your context menu. Or launch ImgBurn and choose "write image file to disc" -- your choice!
No DVD burner? If you have a 4GB USB flash drive handy, check out this app!
Big thanks to Brian Wasylkoski, who was kind enough to let me harass him while he went through this process at the University of Manitoba. --Lee.