Here is what I did to get my 6000L talking to debian nicely. I am just giving you the outline;
the details I think I mostly got from forums here. If you can't locate the right threads, let me know.
A) Desktop side:
1) Rebuilt my kernel to include usbnet support. On debian, make-kpkg is a great help here.
Maybe your kernel already has it. try
# modprobe usbnet
2) added usb0 to /etc/default/ifplugd
INTERFACES="eth0 usb0"
ifplugd is an optional package for debian that configures network interfaces automatically when they show up.
3) added the following to /etc/network/interfaces
iface usb0 inet dhcp
B) SL6000 side.
0) Get a CF card. There may be network ways to get started, but this is much easier.
1) Copy the openssh .ipks to the CF card.
2) Plug the CF card into the zaurus
3) Install the openssh packages. I read that the graphical package installer might have problems, but it was ok for me.
Actually, if you want a simple life, then you could stick to transfering ipks via a CF card.
Now I use sftp to transfer packages from my linux box to the Z. The first thing I
transfered was a terminal package.
So that's the viewpoint of a Linux guy. If you want syncing, you will have to work a little more.