One of the stories that remains a favorite for me is Theodore Sturgeon's "Microcosmic God", which I tore through when I received a copy of the Science Fiction Hall of Fame way back in High School. Sturgeon became an author that I'd turn to pretty quickly whenever I picked up another anthology, and I've generally enjoyed all of the stories I've read from him.
Sturgeon is someone who's popped up a bit in the column already, and he's been someone I've been wanting to write about for a while now. He left an enormous footprint within the SF/F short fiction genre, and his work really ran counter to the largely conservative-leaning authors and stories that had been published by Campbell & imitators.
"Microcosmic God" is still one of my absolute favorite stories in the genre. If you haven't read it yet, go do so.
... are coming.