Cosmere
The cosmere is the universe in which all of Brandon Sanderson's epic fantasy books take place. Concepts currently associated with the cosmere are Shards, Adonalsium, and the three realm structure, called Realmatic Theory.
Books and Series in the Cosmere
Here is a list of all known books or series that exist in the cosmere--that is, they are Shardworlds. Some unpublished novels are indeed Shardworlds. Brandon has stated that there are ten core Shardworlds where the main cosmere cycle will be told. All ten of these planets contain significant Shardic Influence. In addition to these core ten worlds, there are also untold number of other inhabited worlds in the cosmere, with either no Shardic Influence, or only a Splinter of a Shard. <ref name="http://www.17thshard.com/forum/topic/1256-the-ten-core-shardworlds/page__view__findpost__p__20982">FireArcadia's Brandon Interview