Cliche watch: tipping point

This, from Slate's "In Today's Papers" feature, made me chuckle:

The Post's Iraq front pager, while a solid story otherwise, unfortunately asks whether a "tipping point" has been reached. The writers were apparently unaware that a tipping point was reached long ago on use of the phrase tipping point.

As of this posting, there were 2,320 references to "tipping point" in Google News. Even the Wikipedia entry says it has become a cliche.