I saw an 05 radio...compared to an 03, it's like comparing chocolate against sh*t. The 05 radio has the text reader, 6 cd changer...overall it's just better. MUCH better.
As far as the differences go, on the 05s you can see the bumper has changed (i think that's the most significant change on the exterior), in addition to the fog lamps. Basically, on the 05 the fog lights been toned down to a smaller size, and the bumper doesn't stick out from the middle, it sticks out from the fog lamps, and then sinks down on the center.
Personally I think the 05 bumper/fog lights are fugly. But of course, that's just my opinion.