It depends on where you're looking at the list of threads. If it's the main forum, it should always always always go to the first page if you click on the main title! Otherwise, how on Earth will you know what the thread is about?!|
If it's a list of "your recent threads" like in the activity feed, sure go to last page, or your last read page.
Duck Up! is out now on the iPhone and iPod App Store