¡¡¡¡Google has a Google Labs project available called Google Scribe. Google Scribe provides text autocompletion as you type. It provides related word or phrase suggestions, using information you've already typed into a document.
¡¡¡¡"In addition to saving keystrokes, Google Scribe's suggestions indicate correct or popular phrases to use," says Google.
¡¡¡¡Google Scribe will show suggestions as you type by default, but that can be changed to "on demand" or my selecting an "on tab" option in the toolbar. Functionality can be toggled on and off with a keyboard shortcut.