Venus transit today! (Next one in 105 years)
Everything you need to know about it (including how to watch it safely): http://blogs.discovermagazine.com/badastronomy/2012/05/30/everything-you-need-to-know-about-next-weeks-transit-of-venus/
And done. We were too overcast in Dallas to watch any of the transit, but this time lapse video makes up for it: http://www.universetoday.com/95675/stunning-timelapse-spacecraft-capture-the-transit-of-venus/
DAMN, I love the modern age.