Is it necessary for the last post in a thread to come up by default? This is the only list, of the many I frequent, that doesn't load the first post by default. This means I always have to go back to the first post to see what the original topic is, or page up to the top of the page first to read it, and it is a pain in the neck.
I'm serious, no other list does this. From a usability point of view, it makes it harder than it needs to be.
If you load the first post by default, a reader can scroll through to see the responses or just speed-click to the end of the thread to see the latest response.
Think of it from the point of view of someone reading the thread for the first time.