This excerpt taken from the WF 20-F filed Jun 27, 2007.
SFAS No. 157, Fair Value Measurements
In September 2006, the FASB issued SFAS No. 157, Fair Value Measurements. This Statement establishes, among other things, a framework for measuring fair value and expands disclosure requirements as
they relate to fair value measurements. The Statement is effective at the beginning of an entitys first fiscal year that begins after November 15, 2007, with early adoption permitted as of January 1, 2007. Our management is currently evaluating the impact this guidance will have on our financial position, operating results and cash flows.