The ZX Spectrum used to store it's games / programs on audio cassette, a few times channel 4 (UK TV channel) would "play" the code of a demo game and you could plug your cassette recorder into the audio out of your TV and "download" the game.

If it's not too expensive it would be cool to paint a car with it - that would really freak people out.

A few seconds is still few-1 seconds too many I want a machine that can "stand by" using static ram so I can have it on stand by as long as I want without worrying about the battery power trickling away and have it power on instantly(ish)