I just saw The High King by Lloyd Alexander at the library, and am re-reading it for the fisrt time since grade school. A truly great fantasy and coming of age tale, rooted in Welsh mythology.
I forgot how much I enjoyed the Chronicles of Prydain, and I think Alexander is far too under-rated these days, at least in the US. More personal and accessible then Tolkien, less theological than Lewis, these are simply great stories, with a touching gentleness to them despite some major battle scenes throughout.
If you've never read these before (starting with The Boof of Three, I think you'll like them, and they're light, easy reads, perfect for this colder weather. If you have read them before, i'd be curious to hear/read your thoughts; for me, this last book has been like revisiting an old, well-loved friend.