CoolPlayer+ Portable is an easy to use audio player with lots of great features:

Skin support for standard, equalizer and shade mode (fits into a Windows titlebar)
Simple User Interface
Advanced Playlist editor
Internet streaming
ID3 Multitagger
File Renamer
Fast mp3->wav converter
MAD mpeg engine
OGG Vorbis support
FLAC support
Winamp input plugins support
Smallest executable programmed in blazing fast 'C'
Continuous play
8 band convolution equalizer
Lot's more...