Noticed some nice fantasy references in Trails in the Sky SC and 3rd so far. Obvious one is the Wheel of Time. Also, in the PSP version of Trails SC, one of the revive spells is called Athelas. I see in the PC version/3rd that's changed to just Thelas. Wonder if the Tolkien estate sent Nihon Falcom a nice little letter about that :-)
I'm sure I've missed others in the first two games and few chapters of 3rd I've played so far.
In any case, I really enjoy the orbment magic system now that I get it. It reminds me of materia from FF7, both in terms of looks and also how equipping it works. I also like the (what I can only assume) are nods to Xenogears - granted, that could just be the edgy borrowing of Judeo-Christian names and iconography, but the Merkabah's being prominent is one example.
So far, my favorite character is Olivier, by leaps and bounds. Seig is pretty awesome, too
Trails in the Sky SC Chapter 8/end spoilers