I don't usually follow astronomical news, but someone else showed me this and I thought it was only fair that you should know, too

http://www.spacedaily.com/reports/T_...rnova_999.html

at the end:
An interesting, if a bit scary, speculative sidelight is that if a Type Ia supernova explosion occurs within 1,000 parsecs (1 parsec = 3.26 light-years) of Earth, then the gamma radiation emitted by the supernova would fry the Earth, dumping as much gamma radiation (~100,000 ergs/square centimeter) into our planet, which is equivalent to the gamma ray input of 1,000 solar flares simultaneously.

The production of nitrous oxides in Earth's atmosphere by the supernova's gamma rays would completely destroy the ozone layer if the supernova went off within 1,000 parsecs.
Any last words can be submitted in this thread.
Spoiler Alert, click show to read: 
*knocks on wood*