Word is more versatile than Excel or PowerPoint when it comes to manipulating how a table will appear. Go to View>Toolbars Tables and Borders, and also see the Table menu especially, "Table Properties" . (In 2007 go to Insert Table, or Right click the Table)
Often, you will insert a table at the top of a document, and then later realize that you need to enter text above the table.
A keyboard shortcut to fix this is to place the insertion point in the first cell in the top left corner of the table.
Hit Ctrl+Shift+Enter and Word will move the table down and place the insertion point at the top.
This is also the combination used to split an existing table in two. (If there are no entries in the cell, the Enter key will move the insertion point. If there is text in the cell or a paragraph above the table, then the Enter key will just start a new paragraph inside the cell.)