Hello Prentiss Riddle,
Okay, you have a number of questions with your last two posts so I will attempt to answer them all here.
Regarding the UFR2 driver. Just about every current model of Canon imageRUNNER supports this driver, including your iR3035. Canon Australia has posted the v2.00 UFR2 driver for the iR3045, which is the bigger brother to the iR3035, but seem to have missed it for the iR3035, but I believe this is just a management thing and not a reference to the level of support. Certainly, looking through the readme file for the Canon UFR2 v2.00 driver, the iR3035 and iR3045 are listed as supported models, albeit you need to select 'Canon iR Series UFR II (UK)' in the Print Using menu. So I recommend you try using this driver to print to your iR3035.
PPD stands for PostScript Printer Description. It is file that contains information for the printer that describes various functions the printer supports. In order to use this PPD package your iR3035 would need to support PostScript and in Australia this was an option - not sure if this is the same in the USA. If you don't know if your iR3035 has the PostScript support, you would need to check the machine settings. On the iR3035, press Additional Functions > Printer Settings. Scroll through the pages, you are looking for an entry of PS. If you only see PCL and UFR2 then you don't have PostScript so you cannot use the PPD installer. Note that PPDs will work fine with 10.6 as no plugins or filters are required, which is the cause of problems with other drivers on 10.6.
The other items you raised...
The Apple driver update for Canon does not include the UFR2 driver. Most of the driver content is only for consumer inkjet devices, not business copier-based models.
The gdlp01.c-wss.com web site is Canon's global driver download server. All consumer drivers and now some business drivers are available from this site. Most Canon sites are redirecting you to this site for drivers downloads, rather than providing the driver via their own server.
Hope this helps you.
Pahu