I'm still researching different sports that I may want to get Charlie into when he's older (and we get through the long and winding road of basic obedience skills). I was looking into Freestyle (dance) this morning and couldn't find any Corgi Freestyle videos, but found this Freestyle video of Attila and Fly just amazing!
YouTube - Gladiator dog (canine freestyle)
I'd still be interesting in hearing what sport you may do with you dog and why you chose the particular sport!