I found the following journal article -- God in Three Persons: Baptist Unitarianism and the Trinity by Curtis Freeman -- linked from Wade Burleson's blog. It is originally from Perspectives in Religious Studies, the Journal of the National Association of Professors of Religions, Volume 33, Issue 3, Fall 2006.
I've just begun to look over it, but it seems like an interresting read. In the beginning, Freeman starts by looking at some Trinitarian/Unitarian controversy among English Baptists. Do modern Baptists have problems with Trinitarianism/Unitarianism? What is your view? What is your experience?