Thanks for letting me know it's not just me. It looks like there is not an option for playing my favorite station 106.1 KISS FM Dallas on the playbook. Guess I'll just use my iPod for that station. I agree tunein and nobex are good alternatives to iheartradio, just not for iheartradio affiliated stations. Maybe it will work after the next OS update.
I just wanted to post that I randomly went to the website again and tried to listen to my local station and it's working flawlessly! I'm not running the beta.