There is one version you can download for free called step mania
http://www.stepmania.com/
It's a little more fiddly than playing it on a PC than in the arcade, but not bad. You have to get songs and the associated 'steps files' for it though - there are some floating around on peer to peer filesharing systems.
Otherwise, DDR (dance dance revolution) is probably the most popular (which I believe is also available for PC).
There are lots of versions on the Playstation 1/2 - just get the one that has the same songs as the one you like to play in the arcades. The soft mats you can buy are not great though (their innards tend to become misaligned vs the pictures so you have to know where to step).