19. The computer-readable medium of claim 15 , wherein the operations further comprise: capturing a camera image, using a camera of the wearable computer device, when determining that the recognized phrase spoken by the user during the conversation matches the accessed voice command.
15. A computer-readable medium encoded with a computer program comprising instructions that, when executed, operate to cause a computer to perform operations comprising: continuously recording a conversation in a scrolling memory buffer that stores audio data for a predetermined period of time, and that discards the audio data after the predetermined period of time has expired if a user has not issued a voice command to move the audio data to a separate memory for output at a later time; accessing voice commands stored in the separate memory, the voice commands for storing audio data surrounding a receipt of a respective voice command in the separate memory, each voice command being customized by the user to blend with natural conversational phrasing and terminology without disrupting the conversation, and each voice command specifying: an amount of audio data stored in the scrolling memory buffer before receipt of the respective voice command to move into the separate memory upon receipt of the respective voice command, the amount of audio data to move being less than all of the audio data stored in the scrolling memory buffer, and an amount of audio data to record in the separate memory after receipt of the respective voice commands; recognizing, using a processor, phrases spoken by the user during the conversation; determining, using the processor, that a recognized phrase spoken by the user during the conversation matches an accessed voice command; moving the amount of audio data specified by the accessed voice command from the scrolling memory to the separate memory, and recording the amount of audio data specified by the accessed voice command in the separate memory, based on determining that the recognized phrase spoken by the user during the conversation matches the accessed voice command; and at the later time, outputting the audio data surrounding the receipt of the accessed voice command, using an earpiece of the wearable computer device.