Tapatalk Forum App by Quoord Systems. Great app for accessing forums on the iPhone, iPad or iPod touch. Has ranged from 99c to $5.49, but I think, never been free.
Tapatalk 2 is out ($4.49 ), but Tapatalk is still usable, and still easier to use than going on the web.
Great. I always get popups about this app on forums but I've never known what's so great.