I bought a Sartek GoPro Hero housing in Aug of 2010. Works great, and pressure tested to 250fsw. It was Pricey at $99, but didn't look anywhere near as 'ghetto made' as the EofM housing. However, like all of these aftermarket flat port housings, it will vignette at 1280x720p (no problem at the usual 1080x1920 though.)
If you haven't bought a housing and can wait a month, I would hold out for the GoPro u/w housing. I saw it at DEMA and they have their's designed to not vignette w/o any resolution preset on the new Hero2. It look unlike any of the 3rd party solutions with a rectangular port. Supposedly it will cost about $50.
After seeing the image baseline sharpness comparison between the original Hero and Hero2 on a 54" screen, it was no contest. I had to have the Hero2. I picked up a Hero2 at the show as they were $100 off list there until all gone.