I'm a huge fan of Lovecraft's The Dream Quest Of Unknown Kadath.

I also think Paizo's decision to go direct to the source is far better than WotC's "Far Realm." The Far Realm is kind of a generic abberation source rather than being a place of true Lovecraftian horror. Eberron has a better sort of dimension than the Far Realm (or did they just make Xoriat = Far Realm in their 4e rendition of Eberron?).

Xoriat was indistinguishable from the Far Realm in 3.5e, as far as I could tell. They even used cut-and-paste text to describe both.