Dibella's Watch adds an entire new continent to Oblivion. It comes complete with a major city, castles, towns, villages, farms, monasteries and all the good stuff that makes up a Medieval landscape. There's also fighting to be had and quests to be made!
Here's a goodie. Gruftikus has made better Distant Land LOD for DW, which makes the pointy CS mountains look like beautiful rolling hills finally.
Gruftikus' Better Distant Land LOD. Install by dragging and dropping the Meshes folder found within this archive to your Oblivion/Data folder and off you go and admire Dibella's Watch with far better LOD than I could personally render with the CS.
Thanks for this go to Gruftikus. Check out his TesNexus page for more impressive LOD-generation!