You could export your filesystems via NFS:
* create a map of directories you want to export (in /etc/exports; for the format of that file
see man exports; it's simple and the man page has some examples)
* make sure the portmapper (/sbin/portmap) is running (at least needed on the clients)
* start the NFS daemon - /etc/init.d/nfs-kernel-server start; this will start the daemons
rpc.nfsd and rpc.mountd
* on the client side you can now mount the exported directories: mount host:/exported/dir /mount/point
* if all works well you might want to add the mounts to your /etc/fstab file.

Happy experimenting
Thomas