Tables are a powerful mechanism to convey structured information quickly, so they represent an important tool when creating a presentation. Since OpenOffice.org version 3.0, tables are supported natively in Impress, which means that there is no need to embed a Calc spreadsheet or a Writer text table although in some circumstances it makes sense to do so as the functionalities provided by a Calc spreadsheet are far superior to those provided by an Impress table.
Many predefined table designs are available in the Table design section of the task pane.
The Table Design task pane