Apple has just released iPhone OS 3.1.2. According to Apple, the update contains bug fixes and improvements, including:

• Resolves sporadic issue that may cause an iPhone to not wake from sleep
• Fixes an issue that may interrupt cell network services until the phone is hard-rebooted
• Fixes a big that would cause an occasional crash during video streaming

If you’ve got an iPhone, iPhone 3G, or iPhone 3GS, go ahead and update. Of course, if you are jailbroken, you’ll want to wait until a jailbreak tool for 3.1.2 is available.