4. The Wesleyan Anthology of Science Fiction, edited by Arthur B. Evans et al.
I already wrote rather extensively about "Jeffty Is Five" while reading The Voice From the Edge. The other story that really made an impact (above and beyond that I usually experience when reading Ellison's fiction) was "The Function of Dream Sleep." Shortly after reading it I had a rather bizarre, mildly disconcerting, fairly memorable nightmare. I don't think there was any real connection to what I read, but if nothing else the timing certainly provided a interesting coincidence.
Through no fault of its own, The Wesleyan Anthology became the proverbial 800-pound gorilla in my reading stack. I started it back in October, which means this may very well represent the longest amount of time it has ever taken for me to read a book. Granted, the nature of anthologies (and short story collections) makes it easier for me to break the books into chunks and at times put it aside while I read other items. I previously read most of the stories contained within, but of the ones I encountered for the first time (or have no recollection of reading before -- a small possibility), Geoff Ryman's "Everywhere" easily made the biggest impact.
Now that's finished, it's time for a (SF) classic I've never read: Ursula K. Le Guin's The Disposssessed.