Tom,
The drivers I'm using originally came from our Client Access install disks. Setting up a DSN with that driver was only slightly more difficult than pointing to our AS/400's IP address and defining the library list, (and a few other parameters).
Once it was set up, all I had to do was link files to Access, (Get External Data, Link Tables, Files of type: ODBC Databases), using that DSN. When the DSN is selected, the dialog opens a list of files in your library list and you just select the one(s) you need.