Wetpixel user wagsy has posted some sample videos of his first dive with the Sony FX1 HD camcorder in an Amphibico Phenom FX1 underwater housing. Videos range from a few megabytes to one that is nearly 200 megabytes! Grab ‘em before his host shuts him down for excessive bandwidth usage. :)
Also on his website are images showing the resolution difference between HD and miniDV.