I love Jeremy's work on IceWind Dale... but I just got Skyrim today and I think its soundtrack kicks IceWind Dale's soundtrack's rear end. Jeremy Soule's outdone himself, in my strong opinion.
I mostly agree so far (though Icewind Dale is still better) though I've only been playing since yesterday. I like Soule's use of choral music a few times too, and the music when my character was in the mountains was Wagnerian somehow. A lot of the time, the Skyrim soundtrack is unobtrusive though. (I like the ambient sound in the game too, like in the tomb my character is currently exploring; the sound of wind through the tunnels, a waterfall, and more.)
