Beast lightmapping for all objects has superseded the terrain lightmapper. There is a new 3.0 version of the Island demo in the works, but UT has not released it yet.
I was able to play the island demo on Unity3 by commenting "//" out the two lines that start "UnityEditor.TerrainLightmapper.UpdateTreeColor". This should temporarily "fix" the errors you get when trying to play the demo from inside Unity3.
i telecharged the demoIsland de unity 3d. when i try to open it with Unity 3.3
i saw this error:
(Assets/Editor/UpdateTreeColors.js(13,29): BCE0019: ‘TerrainLightmapper’ is not a member of ‘UnityEditor’.)
so i tried to open the script " UpdateTreeColors.js" and i commented “//” this 2 lines:
line of the function static function RebuildWithLightmap ()