For me it Luiglin's tale of feline inclined AI - I think that's actually a very wise comment on the idea of AI!
There wasn't a single story this month I didn't enjoy, but the those by Cat's Cradle, Ian Forty Two, Guttersnipe, Margaret Note Spelling, Starbeast, Daysman, Victoria Silverwolf, Adriano P. Eliezer, telperon, Elkerlyc, Elvet, Jesse Harris, mouse, Clockworkbot, Vince W., M. Robert Gibson, Shyrka, johnnyjet, and star-child stood out for me, with my top 5 in bold.