Engadget reports that Microsoft has released SP1 of it’s Vista operating system to the it’s testers. According to the article, ‘Although there don’t appear to be many new features on top of what we’ve already seen, SP1 appears to be well-received, with testers reporting better laptop battery life, faster networking, and improved wake-from-sleep speeds. There’s still no word on when the final release of SP1 will hit, but if you’re in Microsoft’s tester program, SP1 RC1 is available online now.’