Hotmail Joker
If you use Hotmail and haven't recently checked your inbox etc, I suggest it might be wise to do so. When I checked mine earlier, I was surprised to find my account had been 'frozen' for exceeding the maximum permitted size. This was primarily caused by some joker sending me the same junk mail over 500 times on the same day!
They've all been deleted now, and I've added the offending address to the 'block sender' list, but others might like to take note.