OBL video a fake?

I think so. Mostly because he's wearing the exact same clothes he was wearing in his last (2004) video. It's just too much of a coincidence: surely after 3 years he'd be wearing something different. Or at least not exactly the same. And double-surely any guy who's appearance-conscious enough to dye his beard would be wearing something different. A different robe, a different shirt, something. And the background -- the same plain matte brownish-coloured background, except the new video has a greener tone. But guess what: so does OBL! Look at him, he looks green. Has the colour been manipulated, resulting in this green tone? Little things, but enough that I don't buy that this video is real.

Now here's some more solid evidence that it might be fake: all the references he made to current events take place during a freeze frame. From the Booman Tribune:

"Osama Bin Laden's widely publicized video address to the American people has a peculiarity that casts serious doubt on its authenticity: the video freezes at about 1 minute and 36 58 seconds, and motion only resumes again at 12:30. The video then freezes again at 14:02 remains frozen until the end. All references to current events, such as the 62nd anniversary of the U.S. atomic bombing of Japan, and Sarkozy and Brown being the leaders of France and the UK, respectively, occur when the video is frozen! The words spoken when the video is in motion contain no references to contemporary events and could have been (and likely were) made before the U.S. invasion of Iraq."

Reeeeejected! Now: who really made the video? And why?