It would make things a lot easyer and would make more user go to the forum if they made an ap for the forums. Like the facebook or other aps.
It could give all our mail and activity streams alarts and such on it two making an easy to use one stop spot for andriod and iphone users. Pulse you could make it so you can change your armatar and look at your Rep and AP, or any thing else.
Although it would take a lot of work to make, and it would have to be in a non flash format/platform (like java).