Let's start with the iPhone OS update first. As the version number suggests, there's little to tell here; this is a maintenance update, and brings no new features. The update increases the accuracy of the battery life indicator on the iPhone 3GS, fixes a bug where some third party applications would crash on launch, and fixes a bug which caused some applications to crash when using the Japanese Kana keyboard.
It's important to note that 3.1.3 breaks the jailbreak tools out there, so for you lucky ones who dared to jailbreak your iPhones: beware. I'm sure the jailbreaking tools will be updated soon enough.
The update for Android on the Nexus One is far more substantial. The biggest news is that the Nexus One now supports multitouch in the Browser, Gallery and Maps applications. It has been part of Android and several Android phones for a while now, but was mostly left inactive for the time being.
Other improvements include the addition of Google Goggles, an updated Google Maps application, and fixes for the 3G connectivity problems some people were facing. The update comes in over-the-air, so no need to meddle with annoying sync applications.
The video comes courtesy of Engadget.