I absolutely adore H. P. Lovecraft, and Apocrypha is a stunningly wonderful homage to him and his work. While most people may not know who he is, his work is dark, other-worldly, and very intellectual. His grasp of the indescribable is second to only Poe, and he even credits much of his influence in literature to Poe.
In all: Apocrypha and Hermaeus Mora (in Skyrim), and Hackdirt (in Oblivion) are very well done honorifics to the work of an under-appreciated author such as Lovecraft.
Bethesda makes me happy every time they not only include influences from Lovecraft, but every time they do it so very well.