Canon are offering £25 cashback on this (and other) cameras until Tuesday 27th November, making this one £60 with next day delivery.
Best price I could find for this camera, I know that there are people out there who swear by the Fuji F20 (if you can find one) or Kodaks, but I've had a couple of Canon Powershot A series cameras and they've both been superb.
These cameras use AA batteries, which some people like and others don't. I prefer them as a good set of NiMH batteries will last ages, and if the do run out when out and about I can simply buy a set of alkalines to keep me going!
The only down side from experience is the long flash recharge times.
Review here - http://www.steves-digicams.com/2007_reviews/a550.html