Working with Mail
You can do a quick sort of the items in any folder with a table view by clicking a column heading. Clicking once sorts the items in alphabetical (or ascending numerical) order based on that column; clicking again sorts them in reverse alphabetical (or descending numerical) order.
To sort on more than a single column, select Current View from the View menu, then Customize Current View from the submenu. Click the Sort button, and specify the columns to sort by.