Dont know whether this has already been discussed but to hell with it im gonna do it again.
Smoke Monster Right!!!
If you go back to ther 3rd series right! re-watch the bit where Eko gets killed by the monster. Then look at the series 6 monster and compare them!! The one from series 3 is really black but the one in six is like Smokey grey.
I wonder why this is? Maybe its just a CGI glitch or something.
What do you reckon