The camera on the W580i isn't that bad, as long as lighting is optimum. The same can be said with the majority of camera phones out there. If there is not enough lighting or the environment is dim, then pictures will tend to be crappy. The thing that the W810i's camera has over the W580i is that it uses Auto Focus. If you are going to use your phone more for listening to music than taking pictures, then the camera wouldn't affect you that much. If not for the cam on the W810i, just about everything else is better on the W580i. It has A2DP stereo bluetooth, the 'Shake' feature, Walkman 2.0 (which is more intuitive than on the W810i), and a few other minor improvements.
For pictures, you can find them on other discussion boards or cell phone websites. I believe GSMArena has some sample pics. Otherwise, just use a search engine like Google, and some links would be provided.