Passwords are now stored encrypted in the database (by Swirlee)
Security pacthes (by Sakichan)
Heavy code refactoring.
New template functions: user_login_link(), user_register_link(), user_logout_link(), user_admin_link(), user_profile_link()
New login/registering system.
You can login directly on whichever function page you want. b2edit.php, b2browse.php, b2stats.php, etc… pick the backoffice homepage you prefer.
New post statuses: protected, private and deprecated
Complete b2evo bookmarklet and sidebar
Comment spam prevention (vig-rx syndrome): blocks comments and posts containing blacklisted URLs (if you have had vig-rx posting on your blog, you know why you need this ;) This also applies to referrer spam.
Smilies are now displayed in their correct chosen order. They are not displayed when they are deactivated.
$allow_cross_posting = 0 will disable cross posting among multiple categories.