  The interpretation of results of recent tau decay determinations of |V_us|,
which yield values ~3 sigma low compared to 3-family unitarity expectations, is
complicated by the slow convergence of the relevant integrated D=2 OPE series.
We introduce a class of sum rules involving both electroproduction and tau
decay data designed to deal with this problem by strongly suppressing D=2 OPE
contributions at the correlator level. Experimental complications are briefly
discussed and an example of the improved control over theoretical errors
presented. The uncertainty on the resulting determination, |V_{us}|
=0.2202(39), is entirely dominated by experimental errors, and should be
subject to significant near-term improvement.
