Wikipedia's resources on Data Warehousing are good.
Reading any of Ralph Kimball's books, such as "The Data Warehouse Toolkit: The Complete Guide to Dimensional Modeling "
Yes, ETL is in this space.
You may also be interested in Column oriented databases.
Vertica have a blog with a few posts regarding how they're often better for what data warehouses are used for. For example "Reflections on the Kimball Data Warehouse "Bible": Time for a New Testament?" and "The Truth About MPP & Data Warehousing"
