Brando today launched a new Flexible Mini Capsule Microphone for the iPhone 3GS. The external mic enhances the audio quality and volume compared to recording sound with iPhone 3GS' built-in mic. Here is more info from Brando:
"The Brando Workshop Flexible Mini Capsule Microphone for iPhone 3G S enables you to record better sound quality. Instead of receiving sound from the iPhone speaker at the bottom, your iPhone can receive sound from any direction. It is especially useful while shooting video as the microphone and the camera can be pointed to the same direction. Bend and turn the microphone to the desired direction to focus sound source. Flexible mini capsule microphone gains 25+ dB, sound clarity increases as well as sound quality improves. It works on iPhone 3G S, iPhone 3G, iPhone 2G and iPod Nano 4G.
Features: - Multi-directional adjustment - Plug and Play - High Quality microphone, fine sensibility - Small, Lightweight and Portable Design with jack cover - No Battery is required - Gains 25+ dB