MPEK Slim Light 256 4 in 1 Digital MP3/ WMA Player, Digital Voice Recorder, Portable Flash Drive & FM Radio (256 MB)
This is the coolest one I have ever seen.  It is a sleeky design.  It has 5 color flashing display.  Animation logo or icons display. It has password and FM function built-in.  It is a very very great MP3 player under $100 with these many functions.