I did the latest firmware update from http://chrispix.servepics.com/firmware.htm and now my 300D does ISO 3200 and Mirror Lock Up, features that previously would have meant buying a 10D.
The last firmware gave me Flash Exposure Compensation and other goodies. Now that the cat is out of the bag, why on Earth don't Canon take advantage! It's time to uncripple the hidden features officially; so that they are already on the camera when it's on the shop shelves lined up next to the Olympus and Nikon models?
Pam