I have no idea how many times in the last week I've fell prey to the errant ellipsis. You see it in an instant message and then wait for the rest of the thought like a dog awaiting a promised treat. Alas, nothing follows. Do you ask for the rest of the thought? Do you wait and try to followup next time you see them in person? Or... Even worse... do they not know what an ellipsis means? For some reason more often than not lately I have been a victim of the "I just end sentences with multiple periods" syndrome. Stop it. You can not add extra periods to imply that you are super duper done with your statement. Sure, extra exclimation points are good fun - but extra periods like... mean something - they don't indicate extra done-ness.
Now, I'm certainly not a grammar specialist, but when I see an ellipsis, I get all excited waiting for the held back nugget of drama. Then when it doesn't come I am sad. So, so sad. So please. One period means "statement over," while more than one means "more awesome stuff to come."