Honestly I don't like mobile versions of forums. They're never anything special, and sometimes even complicated to use. I find that the regural forum is much easier to navigate on a mobile web, compared to the confusing and new little mobile forum. Although if I'm ever on the mobile internet, it's usually always on my iPod. I'm not sure if it'd be easier or harder using a mobile version on lets say a blackberry.
Then again, I find all internet use on my blackberry challenging, so it probably wouldn't help me much.