Currently, everything you see on ubbdev as of this moment comes with ubb 7, except for the message icons list (many were added), the topic/reply/closed images and removal of title graphic code.
As for a difference between beta 1 and 7, there are many new features (pm's, member rankings, etc), a completely new control panel, and dozens upon dozens of bug fixes.
[ February 02, 2001: Message edited by: Alien ]