Crazy IM trick: I doubt anyone will have a real use for this, unless there's someone who always tries to read your IM windows. Basically the following is a trick for invisible text. Don't laugh, I'm being serious here. Try typing...
<=body=><=!-- put what you want to write here... like, wow! how did i do this? --!=><=/body=>
into Notepad. Then take out all of the equals signs and Copy it. Also, make sure the Timestamp (F2) is off in your IM window and Paste it there. Send the message and it should not appear at first. When you want to read the secret message press F2! Isn't that awesome?