  We present the first results of a dedicated search for pulsating white dwarfs
(WDs) in detached white dwarf plus main-sequence binaries. Candidate systems
were selected from a catalogue of WD+MS binaries, based on the surface
gravities and effective temperatures of the WDs. We observed a total of 26
systems using ULTRACAM mounted on ESO's 3.5m New Technology Telescope (NTT) at
La Silla. Our photometric observations reveal pulsations in seven WDs of our
sample, including the first pulsating white dwarf with a main-sequence
companion in a post common envelope binary, SDSSJ1136+0409. Asteroseismology of
these new pulsating systems will provide crucial insight into how binary
interactions, particularly the common envelope phase, affect the internal
structure and evolution of WDs. In addition, our observations have revealed the
partially eclipsing nature of one of our targets, SDSSJ1223-0056.
