Third group detects methane
Both these results are being supported by yet another group. Vladimir Krasnopolsky of the Catholic University of America in Washington DC and his colleagues have also found a single spectral line for methane on Mars using the Canada-France-Hawaii telescope. They will be presenting their results at the European Geophysical Union's meeting in Nice, France in April.
From New Scientist.
It will be interesting to see how this works out - confirmation or a strong indication of biogenic methane could have an effect on future lander locations and instrumentation.