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With evidence for the MSW effect in solar neutrinos,
the possibility is opened to test observationally the neutrino interaction properties ???in medium???.
Supernovae (SNe) provide very extreme conditions,
where neutrino self-interactions prove to be surprisingly important.
While a complete understanding of this unique phenomenon in a realistic situation is still lacking,
very likely it is crucial in interpreting some features of a Galactic SN neutrino signal (and potentially to extract particle physics information on neutrinos not accessible otherwise).
After an introduction to SN neutrinos and the formalism/results describing neutrino oscillations in a medium,
I will review the current status of the SN nu problem and briefly address observational perspectives.
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