Finally, I decided to put out a simple file on Etruscan grammar. I've just focused on nouns and it's not that extensive but I can work on it and improve it as time goes on. My grammatical outline differs slightly from the usual, particularly where the case in -is is concerned, often called an ablative case ending, but which I've found to be a directive case signifying direction toward something.
Anyways, the file has been uploaded to the Lingua Files section under Etrusco-Lemnian Nouns. Cheers!
(28 May 2010) As per a later entry, the pdf labeled Etrusco-Lemnian Nouns has now been expanded to Etrusco-Lemnian Declension.