For those who are still looking for somewhere to easily play cylinder chess online (live), you can now do so on cylinderchess.com. I'm a student and put this web app together in my spare time. It's entirely free to use (+ no plugins needed and no ads). Gameplay is on an animated 3D cylinder or you can choose to play on a square board (pieces still wrap around the board).
I am not familiar with this variant, but as most variants, pathguy has it. You can also play in http://brainking.com/ correspondence and using http://home.hccnet.nl/h.g.muller/CVfairy.html to play against an engine.
Also I cannot confirm it, but ICC has lots of chess variants. You might want to check it out.