I also use FStream and it works great on wi-fi with my Ipod Touch. I discovered that you can also find Dis Radio (and all radio stations in Itunes) if you select Favorites, hit Preset in the upper right hand corner, select Itunes, select Pop, then scroll down to Dis Radio. You then hit the Blue "+" on the right of Dis Radio and it automatically adds it to your favorites list. It saves having to figure out the URL to type in. Hit Play and then Dis Radio and enjoy!
I love Dis Radio!!