I haven't read Avram Davidson before, and his "Caravan to Illiel" was a new pleasure. There was a music and rhythm to the writing, and an affected olde-tymey style different from de Camp's and Carter's attempts at such a thing, and more pleasant. The story doesn't have much of a point--it's the journey of a young man on his first caravan, and the weird problems and dangers encountered--but is jolly good reading and whets my appetite. Sadly, it looks like this piece hasn't been reprinted elsewhere, at least not in English.
Leiber's "The Frost Monstreme" is excellent, of course--Fafhrd and the Gray Mouser--but is clearly the first half of something and ends abruptly, to be concluded in "Rime Isle".
The more Witch World I read, the more fascinated I become. "Spider Silk", like "The Toads of Grimmerdale", are set in a post-war Estcarp. The invasion has been thrown back at great cost, and chaos and hunger stalk the land. This appears to be the aftermath of some larger novel in the setting and shows a continuity, even if in this case it is all background information. I don't know if Norton was plugging events or side-plots into the gaps between the books or simultaneous with them, but it is a lovely effect.
The rest? *shrug*