I designed and built the PBS Radio iPhone App that streams the AAC+ stream and provides interactive programme guide from Pulse. It is available from on the iTunes App Store
The app pulls interactive programme guide from Pulse. Pulse is the programme information service for PBS 106.7FM that manages the schedule information for the station and whose job it is, essentially, to know what is on when with as great a detail as is possible. Pulse is a RESTful web service written in Ruby/Sinatra and the UI is pure HTML/jQuery/CSS and uses the same API.
[From their website] For 25 years, PBS-FM has been a beacon of independent, freeform, passionate, real and unpretentious radio. PBS is a champion of specialist and under-represented music and is proudly non-corporate, anti-fashion and wanker-free.