I know I've said this before, but user-selected/purchased dictionary lookup from within the read text (and down the track, encyclopaedia-lookup) is an essential feature for me. Without it, I would abandon ebooks altogether, as other benefits are not of significant enough value to me to abandon pbooks.
As such, I thank Abelturd raising the motion, and then others for seconding, thirding, fourthing...eleventying it, and add my own.
