Ooooooh... CSLewis literary thread... {gggg!}
Yep, USSRGirl has covered all the fictional work. (Fact, she's ahead of me on that, since I've never yet read Till We Have Faces or the Boxen things he did as a child. Come to think of it, you may have read a bit _MORE_ than Lewis' actual fictional output: there is some serious suspicion of the Dark Tower fragments being forgeries, except possibly for the last several paragraphs of it. A literary scholar and late friend of mine, Kathryn Lindskoog, collected evidence for mishandling of the Lewis Estate in three books, the best of which is probably the second _Light in the Shadowlands_. The update, _Sleuthing C. S. Lewis_, I found less interesting for some reason--despite the fact I'm quoted favorably in it. {wry g})
Yep, USSRgirl _might_ like GMcD's work, though it's a bit more surreal sometimes (oddly that would be in his adult fantasy, Phantastes and Lilith, which are more like allegory than anything Lewis wrote aside from Plig'sReg.) McD also wrote a lot of short stories, many of them of the fantasy genre. (He also wrote a LOT of more mundane Charles Dickenesque picaresque work, which little I've read was not my cup of tea. Apparently not Mark Twain's either, since he makes fun of it on occasion. He and MacD were great friends, though.)
GMacD's Christian universalism was not much like the universalism popular today in some circles--most UUs would probably regard him as far too narrow and complex doctrinally. Theologically he was quite orthodox, insofar as I can tell from his writings (which I've studied in some depth.) A bit more conservative than Lewis, actually, in some ways perhaps. But otherwise the two men were _VERY_ close together on the same page. There are reasons why Lewis referred to MacD as his Teacher; and this is not often well brought-out in biographical works about Lewis. In short: if you're okay with Lewis theologically, you're almost certain to be okay with MacD, too. Any problems you have with Lewis, you're probably going to have with MacD.
(And yep, ml, I agree with MacD from TGD too. {s} Btw, I just realized mitsu-ki can be translated ThreeSpirit, I think. {g!})
Anyone having trouble finding the works of GMacD can find them all in print (and most of them free for download as htm files, though without much formatting) at:
http://www.johannesen.com/
Most of his fantasy-fiction work remains easy to find in print, though you're likely to double up on short story collections (no surprise there). The key theological works, in case anyone is interested (and you should be, especially if you're a Lewis fan {beam!}), are the three volumes of _Unspoken Sermons_, and what amounts to fourth and fifth volumes of the same, collected (by Johannesen, who are the American publishers of his literary estate) into a duplex volume: _Hope of the Gospel_ and _Miracles of Our Lord_. (There is also a collection of transcriptions of spoken sermons he gave, but those are not of the same quality IMEv. {s})
WARNING: um, while he isn't strictly Arminian, he is _certainly_ not Calvinist, and gives it a very hard time in some regards. If you're a conservative Presbyterian or one of several kinds of Baptist, proceed with caution. John Piper was confused and disturbed by MacD, to give a barometer reading. (In essence JP's response after reading what I expect was Lewis' commemorative sample collection from MacD, was: how can such an obviously great Christian teacher be saying these things??)