We've seen our fair share of VoIP phones before, but this might be the first MP3 player we've seen that does double duty as a VoIP headset. The Mystic comes in sizes ranging from 512MB to 2GB and plays your typical MP3, WAV, and WMA files. It'll even play back video on its 1.5-inch OLED screen. But plug it into your computer's USB port and suddenly it'll let you take and make VoIP calls (as well as recharge in the process). We like its simple styling and the 512MB model will set you back around $100 bucks.