In general, SMF forum engine looks pretty similar to phpbb3 I'm using on my forum (probably the mod/admin options differ, but that doesn't bother me as a user anyway).
The only thing I'm missing here is a "show all unread posts" button. Am I probably looking in the wrong place?
Ah yes, a quick reply mod would be awesome too
Looks like SMF supports it, but it's either disabled, or not implemented here: http://docs.simplemachines.org/index.php?topic=188.0