well... one way would be nice is that if the phone app has a built in inbox, so that when u get inboxed on the forums, it appears as a text in the app and u can directly reply there..?
i know u can subscibe to stuff and check them on ur gmail, thats what i do, but would be a thought.
not to mention that if the whole website had a mobile version, u can access a mobile version of stats, games, who's online , messages, threads, etc...
could be an idea...
now i go on the forums on my iphone4, which is easy to navigate even in .com mode, but it depends on how much time is invested in those... if worth it ...
as for the forums, its not a bad idea, specially since sometimes loading a page can be a bitch in low reception places...but who's gonna make it ?