Fan of Dance Dance Revolution? Developer Keripo has you covered: on Monday, he released his awesomely named DDR Clone,"Beats, Advanced Rhythm Game."
Because "Press Arrow Keys To The Beat Of Music" was already taken.
The game only comes with a few songs to boot, but it supports StepMania songs and stepfiles - meaning there's already a substantial base of supported music files.
Developers video demo:
Sound like a good time to you?