Here's an interesting article for using audio options on such hybrid cameras.
Jon Fairhurst of P3Pictures has done quite a study on audio options for hybrid cameras. Although P3Pictures uses a Canon 5D Mark II for its testing, at least some of their conclusions could apply to other hybrid cameras, including the Canon 7D, Panasonic Lumix GH1, and others yet to be released. P3Pictures’ goal with these scientific tests is to find the most professional quality sound, with mid-priced equipment. In all tests, P3Pictures uses the M-Audio Microtrack II, Zoom H4n, BeachTek DXA-5D, and the juicedLink CX 231. The first test is done with a closely placed shotgun mic. The second test uses a camera-mounted shotgun. The third test is with a wireless lavaliere microphone. Part 4 is foley recording, and Part 5 explores the noise floor of each option. Part 6 are P3Pictures’ conclusions