They're either Graptopetalum, or Graptoveria, or Echeverria. I'm not qualified to say more than that, but it's a start, at least! I'd suspect Echeverria, simply because it generally has the more spectacular flowers of the three.
Welcome yippy13 Possibly Echeveria elegans http://www.google.co.uk/search?hl=e...m=isch&source=og&sa=N&tab=wi&biw=1247&bih=496 http://www.flickr.com/photos/31765147@N07/3755596773/