Really good things going on over at Maverick Philosopher, as usual. William Vallicalla has been writing an excellent series of posts analyzing a mereological model of the Trinity. The posts and the discussion in the comments under them are worth checking out.
A Question About Predication and Identity
The Logical Problem of the Trinity
Mereology and the Trinity: A Response to Wong
Is the Skeleton of a Cat Feline in the Same Sense as a Cat is Feline?
A Survey of Responses to the Three-In-One Paradox
De Trinitate: The Statue/Lump Analogy and the ‘Is’ of Composition