Thanks Neil (+sloow) for responding.
So Neil is the Mac TR12-220.127.116.11-5 firmware update all I need then and not a new Driver too?
On the HP site it says check to see if you have the latest "Driver" to suit the new Firmware but that link doesn't actually go anywhere helpful!
I did read your post about Leopard upgrade so all sorted now?
I just looked, it's the same Universal Binary version 3.1. No difference Leopard or Tiger. The firmware is a separate deal that you download and send to the printer via Ethernet or USB.
They often had questionable frmw updates but they must have worked out everything for this one as it is half a year now without changes.
Yes they have dead links in their automated programs inside the software. It was a good idea to include it, but they should take care to update links in the software so they redirect to the right pages. Not a big deal but could be done correctly, or simply removed in future updates.
There was a Nvidia update last week that was pulled from Apple that is causing some glitches on my Mac PRo. It seems to not display the right quarter of menu bars in the finder or some apps like photoshop after sleeping sometimes. Otherwise I do think you'll be fine with both.
If ever, the firmware seems not to be loaded as it doesn't reboot as expected, just hard reboot it manually. It almost always is indeed loaded which is displayed in the start up LCD window.