Apple has just released iOS 5 beta 2 (build 9A5248d) for iPhone, iPod touch, iPad, and Apple TV, and iTunes 10.5 beta 2 for Mac. It's a rare Friday release for a company that, in the past, has typically released every second Tuesday.
It's also a large release, the iPhone 4 version weighing in at over 817MB (hey, those notifications gotta sit somewhere!).
As always, you need a paid developer account with Apple to get it (don't fall for those UDID slot sale scams!), and installing via Xcode is usually your safest bet.
If you're downloading now, be patient. Apple's servers are no doubt being slammed. When you get it, let us know what you think! And don't forget to head on over to our iOS 5 Forum for the latest discussions!