Hi Brett,
From what you have said, looks like your iR doesn't have the Universal Send option. Just to be sure, you should go to the copier and have a look on the touch panel for a button that shows Send. You will see Copy and Scan (which is for Windows). Hopefully there is Send as well. If not, then you won't be able to do what I advised previously, using FTP or SMB.
Re the Mailbox, the scanned documents in this area use JBIG compression to store. To view these documents, you need the JBIG plugin. Can't remember if there is one for Mac. Certainly is/was for Windows. Anwyay, this method to scan is not ideal. The image quality is very low res.
So if you don't have Send, how were you scanning in Tiger? I doubt you would have been using the Mailbox. I can only assume that your iR C3220 does have an imagePASS attached and that you were using Fiery Remote Scan. This app includes a plugin that appears in the Acquire menu of Photoshop.
If you do see the white metal box on the back of the iR, or if you see the Printer tab next to Copy and Scan in the touch panel, then you do have the imagePASS. So, you will need to install Fiery Remote Scan on the Mac, or check to see if you already have it by going to Applications and looking for a folder called Fiery. If you have this folder, open it. You should have a Fiery Remote Scan folder. If not, you can download the application from;
http://software.canon-europe.com/software/0027431.asp?model=
Unpack this file and run the installer. This will create the Fiery Remote Folder in Fiery. Once this is done, open this folder and run Fiery Remote Scan. You will be prompted to enter the ip address of the imagePASS, a nick-name and a model name, which you can enter as iR-C2. Once that is complete, the Fiery Remote Scan app will open. There is two parts. The first is where you retrieve files that you scan to the imagePASS mailbox, not the iR C3220 mailbox. The second, with a heading of Initiate, is where you set your scanning conditions, such as resolution.
Now, on the copier, press the Scan tab on the touch panel and press Online. Load you document into the adf or onto the platen and go back to your Mac. In the Fiery Remote Scan windows, select Initiate, make your scanning selection, and click Send. This will present another sheet where you choose your scanning destination. Now, this is where Fiery Remote Scan has a problem on Leopard. This second window appears behind the first, meaning that you cannot select the destination to scan the file to. The workaround is to move the Retrieve window to the left. Then, when the next window appears, you will be able to see it. Choose the destination of choice and click Send to complete the scanning.
Hope I haven't missed anything with the instructions. Let me know how you go...
PaHu