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Lenovo weighs in with its own take on the cube—the Easy Cube M500 is 2.75 inches square, which is apparently just enough room to squeeze in a portable speaker, four AA batteries and an SD memory card that you supply yourself.

Maybe that's why it only costs $50, a great deal if you want to play MP3/WMA audio on the cheap and already have an SD memory card and a closet full of batteries. Perhaps Wal-Mart will pick this up as a larger alternative to the hot-selling Mobi-BLU, while conveniently locating it near the battery aisle.

Lenovo Easy Cube M500 [The MP3 Players]