I know on a nano you can get a little radio remote, will this work on a touch? I know you can get internet radio but this isn't reliable for me, more time is spent buffering.
this does the job - http://www.johnlewis.com/230453616/Product.aspx for both FM and DAB - and despite not being listed, it works fine with my 2nd generation ipod touch, though is fairly heavy on battery life