I was reading the manual for my iRiver a few days ago. There are lots of details and acronyms in the digital music world, and it's sometimes hard to figure things out - especially if you aren't very technical. For example, the player will display an icon telling you what format of file you're listening, but not everybody knows what an OGG format is.
The folks at iRiver have taken that into consideration, and they've included this handy graphic:
Now that's helpful.