i have been seen this plugin on buxville : Lights. when is night the lights goes on as glowstone and when its day glowstone turns to glass! i mean its tall light made of fence and glass/glowstone. any one link please? i havent found it.
This still works fine for me on cb935 http://forums.bukkit.org/threads/inactive-mech-lampstone-v0-6-automatic-night-time-lamps-677.7030/