Ive just added two new ones to show the developments in Mesogea. Others?
New quests, followers, companions, absolutely huge landmass, new creatures, new cities, towns, villages, locations, custom cliffs and mountain meshes, moving water, birds, insects, custom sounds, custom voices including rumours and conversation etc.

http://www.youtube.com/watch?v=aYK-KhA0FUA&feature=plcp

http://www.youtube.com/watch?v=p-SZQ35CVbk&feature=plcp