Dan Wiener, editor of The Independent Adviser for Vanguard Investors, reminds us that the traditional year-end spike in municipal money fund yields is in full swing. "Since Dec. 12 ... Vanguard's Tax-Exempt Money Market has seen its yield bound from 3.37% to 3.73% over the past 8 days. Various state tax-exempt money funds are up between 36 and 38 basis points," he says.