Instead of mapping to a table, can a person map a BO to a Query?

Jason,

The only way you can map to a query and have the strong-typed properties created is by mapping to a view.  This allows you to pull from a number of different tables at the same time and bring the data into a single business object entity and still have the strong-typed property access.

If you don't need the strong-typed properties, you can pull any query into a business object because the business object stores its record sets in a DataTable, which is malleable, so it can contain any number of columns.  All of the retrieved columsn will then be available through the Item() property on the business object.