The Creation Kit tutorials offer a host of various tips, tricks and guides on how to get the most out of Bethesda's modding software.
In today's tutorial;
Developing a dungeon a little further, and allowing you to be a bit more creative, via the introduction of an organic and free-flowing cave system. Caves work on different principles than dungeons, so keep up, and by the time the next video rolls around we'll have a fully cluttered dungeon with its own cave system!
Link to my ready made dungeon - http://skyrim.nexusmods.com/downloads/file.php?id=8508
Creation Kit Tutorials Playlist - http://www.youtube.com/playlist?list=PLE3E7CC13B95E5AB6&feature=view_all