I'm pretty sure Yately is in the UK. I suspect you need Flash to use the iPlayer. Not sure if they've made it iPad friendly yet.
I know there was a bit of a discussion within the Beeb a year or so ago about why they should be spending license payer's money to format content specifically for a single manufacturer's device (iPhone) when the penetration of that device was so small in the UK. That's why it's taken the Beeb so long to release a news app for the iDevices...they're funded by license revenue rather than advertising, and the government's had them under the microscope recently, so they need to be a bit more careful about jumping on bandwagons.