A matching Sansa HP Amp would have been something cool. Same exact size as a fuze and mounts to it.
Or a new fuze with 120gb, sd slot, user-replaceable battery (instead of a throw-away player), even better sound, gapless, still drag n drop but with even more codecs.
Or maybe a Sansa Fuze-phone .
Or Fuze with FM and XM and wifi internet.