+1 for the DC forum (generic SMF access) app, though I'm not sure if it was suggested in jest.
Safari won't let you upload images or any other files to the forum, so anyone using an iPad can't fully participate unless he's using a jailbroken device with a 3rd party plugin or one of those full-fledged forum apps that have a list of forums they support and need each forum admin to do some tweaking/installing before the app works there. They also have a very different forum interface than the one we're used to.
So basically, a regular browser framework with the added ability to upload files.