I took a standard cover page, edited it, and saved it under a new name. The cover page editor sees my new page and can LOAD and edit it. However, the Fax Finder Client Software does not show my customized page in the list under COVER PAGE STYLE.

You must save the newname.cpg template file in the "C:\Documents and Settings\<user>\Application Data\FaxFinder Client Software\Cover Pages" folder if you want it to show up in the client software.