If you're into shooting and especially if you carry concealed - this is pretty awesome.
Lucky Gunner just launched a huge data dump of ballistic test results. 117 handgun rounds in 9mm, 40 S&W, 45 ACP and 380 ACP.
9mm Federal HST up above. It did pretty well but some of the results, like the Golden Saber stuff seemed to perform better than I would've expected.
There is a slow-motion video for each round that's good eye candy too - even though I'm not sure technically what it's supposed to show me.
If you get a chance and you're into guns, I'd definitely recommend checking out the whole post. They have some tables that are pretty helpful at the bottom of this page.