Look out Flip: Apple today announced the iPhone 3GS, with an improved built-in camera that records video and audio. It features auto-focus and auto-exposure, and also offers some basic editing capabilities: drag the edges of the filmstrip to select a portion of the video, then tap Trim to cut it down. You can’t mix and match clips (that’s what iMovie is for), but it’s a good easy way to trim a clip you just shot before sending it to a friend or uploading it to the Web. Apple’s Guided Tour video of the new iPhone shows the feature in action.