Great-sounding, reasonably-priced microphone, purpose-built for the iPhone/iPod touch/iPad, with few downsides.
The iRig mic [Amazon.com] was introduced a short while ago, and promises to be one of the best ways to get sound from your mouth or instrument into the iPhone 4, iPod Touch or iPad/iPad 2.
Perhaps you're tired of taking pictures with the DIY Greenscreen you just made, or you have had enough fun (for now) keying out backgrounds in Photoshop... but now you want something more. But you don't want to spend more than 2 minutes setting up for your next project. Well, how about a do-it-yourself mini macro studio that is made of materials you already have within arm's reach, and can set up in less than two minutes?