Does anyone know some good references I could refer to in order to
become more familiar with it?
The manual... :-}
Has it been applied to morphological data before?
Yes, though only a few times. Wiens, Bonett & Chippindale (2005, Systematic
Biology) use it but don't explain how. A trilobite paper from Systematic
Palaeontology, IIRC published the same year, explains more, I think. Then
there's Müller & Reisz (2006, Systematic Biology) which IIRC gives a fairly
adequate explanation.
Does anyone have any practical experience using MrBayes?