system-config-samba

system-config-samba is very easy to use, and works with serveral distributions. it is written in python and glade.
other samba GUI tools need to break your samba configuration to regenerate own, and are (very?) complicated to use for lambda user. but system-config-samba use and modify your existing without breaking anythink.
however, project seems abandonware, options are basics (and works well) but if you need to manage -a little- more fine your shared accounts, it is not able to.
system-config-samba need to add at least:
-restart samba service
-manage group (@groupname)
-more options for shared directories (create mask, create directory, read/write access not completly implemented, etc...)

if someone is interested to upgrades functionality and/or to create similar GUI SAMBA Tool, please contact me.