Have you had any luck getting the P1006 to work? I'm in a similar situation and I haven't found anything that works. I'm trying to install on a MacBook running 10.4.11. I've tried both the 1.0.4 and 1.0.6 versions of the drivers with no effect.
The printer is showing up in the Printer Browser window, but it's not showing up in the "Print Using" drop down menu.
I tried a manual uninstall and a clean reinstall. Didn't work. I did noticed in the uninstall instructions on HP's
website that the file /Library/Frameworks/libZJBIG.dylib is shared with several other printers. The uninstall instructions say not to remove this file if you use these other printers. I don't, so I went to delete it. But upon checking, I found that the p1006 installer hadn't installed it. I thought this might be my issue, so I installed the drivers for one of the other printers that share this file. I now have libZJBIG.dylib, but still with no results.