Argh, could you please correct the title, should be:
Mansfield: A Final Warning from the Islamist Rulers of Iran?
So sorry.
This is a vitally important take on the Ahmadinejad letter.
FYI
Laura's credentials are excellent, and her analysis looks solid.
All in all, this looks like the most likely reason for the letter.
It would be useful to know if Ahmadinejad has obtained a ruling from the ayatollahs that this letter constitutes sufficient warning within the meaning of the koran.
I would be surprised if he sent the letter without getting such a ruling in advance.
She is not alone. Robert Spencer (JihadWatch & DhimmiWatch) agrees, as does Charles Johnson (LittleGreenFootballs) http://littlegreenfootballs.com/weblog/?entry=20504_An_Islamic_Declaration_of_War&only