And if that fails, look into VueScan. I like it a lot.If you plug it into your USB and click software update in apple menu, if there is a driver available from apple, it will come up, otherwise check out the following link.
HP Scanjet Scanners - Mac OS X 10.6 (Snow Leopard) and HP Scanjet support - c01863616 - HP Business Support Center
And if that fails, look into VueScan. I like it a lot.
Looked at the link, and not heard of this before, would you mind filling me in?
Hmmm, googling away
I know this is a long shot, but have you found any way to get a list of scanners does/doesn't work with?