I've just posted a longer article on my homepage, On Identity Statements: Against the ascriptional views.
Apart from minor revisions, it is about 18 months old now. I would not write it in the same way now, but I still hold the views expressed there. Comments welcome, here or by email (my email address is on my homepage and on the 'About/contribute' page here).
UPDATE 21/06/2016: I have removed the link, as a descendant of this paper called 'On Identity Statements: In Defense of a Sui Generis View' has finally been accepted for publication.