Pulsation modes have recently been observed in a handful of white dwarf (WD) primaries of cataclysmic variables, allowing an interesting new probe into the structure of accreting WD's. We briefly discuss the seismology of these objects, how stellar properties may be inferred from the observed mode frequencies, and mode driving mechanisms. For one pulsator, GW Lib, we have shown that a WD mass M 1.05 M and accreted envelope mass Men, = 0.4 x 10~(-4) M_o give the best match to the observed pulsation periods. A first exploration of mode driving favors Teff = 14000K and a massive WD, but more work is necessary.
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