CNET UK has an excellent feature today explaining exactly how you can get the BBC iPlayer on your iPad. For starters, the article says that you should forget all about using the iPad’s proprietary browser, and instead download one of the alternative browsers from the App Store that are available primarily for the iPhone, but can also be installed on the iPad, such as Sphere Lite, Atomic Web Browser Lite, or Perfect Browser 3. According to CNET, all three browsers were able to load the iPhone version of the iPlayer on their iPad, as well as playing radio and video streams.
To get full-screen video using this work around, use the 2x zoom feature. The quality isn’t that great, apparently, but it’s better than nothing!
It’s always possible of course that the iPad will one day get an official version of the iPlayer, but don’t hold your breath waiting on the BBC.

By Maura Sutton, iPadForums.net
How to get BBC iPlayer on the iPad - Crave at CNET UK