Apple have released iOS 5 beta 2 to download for all registered developers. To download iOS 5 beta 2, you need to be a registered member in the developer program (cost: $99/year) but if you are not a developer, you can still download this release from here. Make sure UDID of your device is activated before you install iOS 5 beta 2 on it. The workaround used to activate iOS 5 beta 1 without UDID activation does not work on iOS 5 beta 2. So before you download iOS 5 beta 2, first find out the UDID of your iOS device, get it registered and then proceed to download iOS 5 beta 2 direct from these links.
In order to upgrade your iPhone, iPad and iPod touch to iOS 5 beta 2, you also need to download iTunes 10.5 beta 2.