Yeah I know... the S3 came out about 3 weeks after I bought the S2, and it also has the 2.5" screen & 6MP vs the 5MP on the S2, and it's Black! And of course the price was the same as the S2 was, and the S2 dropped $50. :(
I did purchase a bunch of adaptors,a wide & tele lens, and a set of filters. I recommend to anyone with a Powershot to at least get an adaptor & UV filter to protect the lens. Besides the lens cap that comes with the camera is annoying because it either falls off by itself (it's only friction fit) or if you forget to remove it before turning on the camera... that is the automatically zooms out and as such doesn't have a cap that fits tight. With an adaptor & filter you can fit a normal 58mm cap on.
At least the Powershots use the SD memory sticks... which can be picked up pretty cheap now. I don't know if the S3/S5 has been upgraded but the S2 is limited to a 2GB stick, and it has the weird quirk that you can only shoot 1GB of video at a time, so with a 2GB stick it will shut off after 1GB and you have to hit the video button again to continue. Would be nice though if one could use the 4GB HD... although I wouldn't recommend to use just a single 1 or 2GB stick for shooting photos only. Better off using several sticks so if one screws up you don't loose everything.
Doug