I was able to enter it as a 1099-MISC without it counting as self-employment income: I entered the AmeriCorps Education Award as a 1099-MISC into TurboTax (Home & Business download), and selected "no" when asked "Does the AmeriCorps Education Award involve work like my main job?" and selected "no" again when asked "Did the AmeriCorps Education Award involve an intent to earn money?"
