Mac OSX users, I have found and used the following 2 ftp clients to send data to my Tivo. Some FTP clients do not make it easy to upload in Binary. These two do.

Free for 30 days - Transmit http://www.panic.com/transmit/
Open Source and Free - http://icu.unizh.ch/~dkocher/cyberduck/

I have made Cyberduck my FTP client (despite the bad name) as I love open source.