The rendered output of positional lights (2nd row in above url) is significantly different from that which is expected. This maybe a platform issue as i' m certain these used to work on my mini, and i've gone back a reasonable way in nightlies and bug is still there.
Position of light (2nd row again) appears to change as window is resized.
As yet I can't confirm whether this is a platform specific bug or a regression.
Lighting filters are implemented, and it works under both Mac Leopard and QtLauncher.