Largest-ever meteorite crater found in Australian outback

Largest unless the Wilkes Land crater proves real

http://en.wikipedia.org/wiki/Wilkes_Land_crater

A lot of the craters seem to match up with extinction events which is kind of relevant to the debates over the dangers of climate change - if all the major extinctions were huge astroids hitting then regular climate fluctuations are less worrying I guess.

I'm kind of fond of the Antipodes lava flow theories such as that an impact may have caused Hawaii:

http://www.rense.com/general12/created.htm