WMD found?

Not quite. If this "Traces of sarin in bomb story" turns out to be true, it isn't even remotely proof that Dear Leader was right. Before the right-wing bloggers start citing this as vindication, remember that chemical weapons were a specialty of Abu Musab Zarqawi, the Al Queda leader who operated in U.S.- and Kurd-controlled Iraqi territory before the Gulf War II.
From a Slate article I've cited before:

As far back as June 2002, U.S. intelligence reported that Zarqawi had set up a weapons lab at Kirma in northern Iraq that was capable of producing ricin and cyanide.

This is the same guy who could have been killed long before the invasion had the White House just given its OK. But that, of course, would have undermined the need for our invasion.