The alternative of course, for anyone not aware of it, that if you don't put your MP3s in the Audible folder you can indeed play them while you are reading -- but you have little control over them because they play in consecutive order.
Sourcing them in the Audible folder gives you a bare-bones interface with which you can control playback -- though my own experience is that the Kindle doesn't always 'remember' your place, which is a nuisance if your MP3s are longer podcasts.
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