At first it was just one, then it was two, then it was three. He's still doing it, taking a step or two or three unaided and balance before plopping down and crawling, so it's no fluke. The gait is very early-Frankenstein's-monster, but it's walking. Also, he crawls up full flights of stairs on his own now.
Duncan turns 10 months old tonight. I'm torn between being proud of his precocious gross motor skills and being terrified.