For hardware it's probably the 2.3"x2.7" custom dc2dc power supply, or the extensive mods I made to the head unit for getting the sound in, and the switch on control out.
For software it's gonna be the custom software I wrote, including dos sound drivers for the es1869 sound chip, fast precompiled playlist loading for a fast boot, the DOS port of mpg123 for playing and the way it caches up to two songs in memory at once so that it doesn't need to stream off disc, avoiding the possibility of skipping and reducing the possibility of head crashes (I could shut down the hard drive between songs if necessary). The menu system is just boring.
Overall, it's probably the size of my player (12"x6"x2" including psu).
Rob



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