Canon had the imagePress C6000 driver we needed on their site. The download we needed was the PPD_V3.35_Mac.zip, for anyone wanting to know. This should have good drivers for a variety of Canon printers through MacOS 10.7.3
So, when adding the Canon imagePress C6000 driver, we had to:
1. Download the print driver from the Canon.
2. After the downloaded PPD_V3.35_MAC folder unzipped, we located the correct driver (CNPRC60X1.PPD.gz) in the correct subfolder (MacOS X > iPR C6000)
3. We physically placed the CNPRC60X1.PPD.gz driver in the Library > Printers > PPDs > Contents > Resources folder.
4. Then opened the System Preferences > Print & Fax
5. In the Printers columnm, we clicked the '+' to add a new printer.
6. Under 'IP' we used the the Line Printer Daemon Protocol and added the IP Address for the C6000 in the 'host name' line. For the 'Queue', we selected 'hold.' We also gave the C6000 a name and for 'Print Using' we browsed to the driver we installed through the 'Select other software' option.
This gave us a connection to send the files (Adobe InDesign and PDFs) to the printer and hold them in a queue. (Otherwise, they print directly without allowing the use of any of the C6000's document handling features.) From the queue, the operator was able to set up special parameters for utilizing the features of the C6000.
I hope this helps someone else, though our case and solution was pretty specific.