Hey Pete,
i know the 360° and 180° Fisheye Cameras from Vivotek. They are great if you just want to know whats going on (for example university, school, store), but they dont fit if you do some real cctv-surveillance. So, i aggree with ssnapier and survtech. if possible, use two good ip cameras (brand doenst matter that much, samsung, sony, bosch, mobotix, dahua..)
best regards