I was just wandering around through the Musica Russica website and noticed that they provide Diction CDs for use with your choir that needs to sing in Russian, Ukrainian, or Church Slavonic. They have pre-made ones for the most common texts and will produce custom ones with rights to make as many copies as needed. First the texts as spoken and then they are chanted so that the singer gets a sense of the vowels and consonants in singing the text.

Most of us can rattle away in Ecclesiastical Latin. Most singers can't - and the pronunciation is a problem for many. Since everyone seems to be doing projects... Has anyone done something like this for Latin that's going to be sung?