Thanks to XPerience for this handy tip, which is also floating around on the Google Groups: comp.publish.cdrom.software - Nero v5.5.8.2 Nero Express interface thread.
If you want to check out the new Nero Express, it's been included in the latest release 5.5.8.2, it's just been cleverly hidden....
- Start Nero with nero.exe /w and you will get Nero Express, it's that simple...