One of the things that seems to excite Skyrim modders the most is the idea of seeing other parts of Tamriel in Skyrim. That's the button this
Beyond Skyrim: Cyrodiil Bruma teaser pushes, and it pushes it hard.
The Beyond Skyrim modders at DarkCreations intend to start with Bruma and piece-by-piece bring all of Cyrodiil into the game. The mod will feature new quests, creatures, and dungeons, and a storyline about Cyrodiil set at the time of Skyrim. From the description:
"This is only a small first taste of the larger project Beyond Skyrim: Cyrodiil - The Seat of Sundered Kings, an upcoming province mod for Skyrim, and part of the Beyond Skyrim project, that will allow you to explore Cyrodiil during the Fourth Era time period that Skyrim is set in, reflecting the political struggles of the time and allowing you to participate in the turmoil over the succession of the Ruby Throne and decide the future of the Empire."
If you want to help out with the mod, you can sign up here:
http://www.darkcreations.org/forums/topic/1814-general-signup-thread/