Hmm, done a bit more testing today. TalkPhysics works on the Kindle – you can search, post new topics, etc.
iPhones and BlackBerrys (BlackBerries – spelling?) fail in the same way – the main text box you type into “Add a comment” is not recognised by either phone as being somewhere you can edit. So as a minimum, that needs to be fixed. I’m curious why the Kindle’s browser handles it, but neither iPhones nor BlackBerries do, but there we go.
Beyond that, we need to present a different “CSS style sheet”, so users only download the minimum of data via their mobile signal, and the browser only has to process and display the simplest possible page.