How can you justify text in Word 2007 and not have the last sentence look really spaced out? IE:
The Last Line Looks Like This to fill the space.
Normal justification of a paragraph does not make the last line spaced out; instead, it is normally flushed left with no extra spacing between words. The problem you describe seems to appear only when the paragraph has been terminated by a forced line break (Shift Enter) rather than normal paragraph terminator (Enter).
So clicking on the end of the last line, hitting the rubout key “←” (to remove the forced line break) and hitting Enter should fix the situation.