CLI apps rsync and scp work well.
A nice GUI app I use is the kio_fish slave to konqueror.  Transfer is 
via ssh.
http://www.garni.ch/fish/
May already be installed (part of kdebase).

Bob

jim scott wrote:

> Hello, all. I'm going to connect up 2 Linux boxes on a home network. 
> I'll connect the boxes and my DSL router/modem to a switch. Right now, 
> I've got all incoming services disabled on both computers -- no 
> telnet, no ftp, no rsh. I would like to be able to copy data from one 
> PC to the other. What's the most secure service I can  use for 
> occasional data transfer between the two PCs? Thanks for any advice.
>