I know there is an application running under Gnome that allows you to browse just like "network neighborhood", I'd check on source forge for that one. For backing up, I'd use something like Arkeia Lite, providing you have a SCSI tape drive on your system. If you don't, there are way to back your entire system to a second harddrive using the dump command. I would, however, look at a web based admin panel like Webmin (www.webmin.com). Webmin has a nice GUI to run and schedule full or incrimental backups of your system, as well as, easily creating network shares in Samba.
To create a file share that's accessable by all users on your network, you can edit your smb.conf file located in the /etc/samba/ directory. Create your directories from your terminal:
mkdir /usr/local/samba/shared
chmod 777 /usr/local/samba/shared
Add this sample to the smb.conf and edit as needed:
[shared]
comment = Public Share
path = /usr/local/samba/shared
read only = no
This will allow allauthenticated users access to this directory. If you want to allow non-authenticated users, add this below read only:
guest ok = yes
Good luck!