lol, sometimes I fear that I am overusing them so I just leave off ending punctuation. (but now you know that when I do that there's really an invisible exclamation mark there)
LOL, I'm totally addicted too!! I love reading over my replies after they're posted, and realizing that there are like 10 sentences and every single one has 1, 2, or 3 exclamation points after them! I'm surprised that key hasn't popped off my keyboard yet!
I almost posted the very same thing yesterday. I'm awful about it and often go back through e-mails to change them to periods! I'm just happy, that's all!