oh its especially horrible with olympus sp-550. anything beyond iso100 is downhill. iso50 is the only noise free (well if you call it noise free) setting. (that picture was iso100 as far as i remember and i always avoid going over iso100)
iso200 is very usable for general purpose shooting but dont expect super sharp results with alot of detail unless you are willing to shoot in raw converting it and editing it with a pp software. iso400 becomes pretty unusable for any kind of serious shooting but only for yeah been here done that kinda shooting. iso800 forget about it, 1600 is a joke, 3200 is not even a funny one, 5000 is a puzzle. well a scrambled one that is.
even tho this camera is marketed (and the specs on the box might think you it is) as an action shooting model, its shutter lag is pretty unacceptable, focusing is not very suitable for action shooting (it does work fairly fast for a p&s but if it gets it right and focuses on what u really want).
olympus sp-550/560 and 570 are really very decent cameras (570 not so great in terms of price performance) but definitely they have their drawbacks as they are still point and shoot cameras.