Or... If you aren't able to play a dancepad game at the moment and suffering from withdrawal, you could always try out Flash Flash Revolution:
There's also the "Zoo Bar" and, er, dance music: Block Rockin' Beats, Spin Spin Sugar, Get Busy, Cotton-eye Joe, Another Night Another Dream, Around the World. Also, some older classics: Pump up the Volume, Twilight Zone, You Gotta Move It, We are the Champions, We Will Rock You, Kids in America, I Like to Move It, Flashdance; and this other category that defies description: Kung Fu Fighting, In the Navy, I Will Survive, La Bamba, YMCA. Of course, you could always get the disney mix and be DDR'ing to Supercalifragilisticexpialidocious if you really want to.
There are plenty of other interesting DDR videos, including a Counter-Strike one.. haha There are also also videos of large groups of people "shadowing" -- an excellent choice for former country line-dancers. hehe
If you'd like a little variety, check out Flow: Urban Dance Uprising, which has a hip-hop, breakdancing theme. You can stick to the dance pad, and your on-screen character will perform the breakdancing moves for you. This game does have some interesting features and catchy tunes... "Purple Perpendicular Phonics"