say you have a picture of a character, and floatright it. The character description and such all flow around the picture to the left.
I'd like to create a 'break' in the text, so the next block starts beside another floated picture. This effect can be done by putting each block of picture/text in separate posts. But if you have a float function, it would seem intuitive to me to also have the clear function. (I think probably intuitive to anyone that uses css much.)