Technically, yes, it's possible. The limiting factor is my time, so I'd have to say, don't hold your breath.

It's not possible to build fancy interfaces for mobile devices because of screen-size limitations. All of the fancy navigational stuff you see would have to go away, and the interface would go back to the Web's original system of navigating through a list of subject lines, clicking on one, and changing the whole page to the message. When you're done reading you click something like "Done" to return to the TOC. It's not a pleasant experience, but it's workable; and it means building an entirely new interface.

In a related vein, I've considered creating RSS feeds for each board, that would list new messages and let you click to read the message. That amounts to the kind of interface you need for a mobile, and it can also be used in "real" Web browsers to provide message digests and that sort of thing. The odds are that I'll create RSS feeds before I create a mobile interface, and that may be enough for mobiles too. I'm not entirely sure, so stay tuned.