Is the color management done properly your software? There will be a shift if the correct color profiles are not used.
For example, on Mac, Safari and Preview are color managed, but Firefox isn't. Picasa for Mac isn't either, and I was surprised to see that the images I have only resized before exporting would change colors. Even my RAW processing software didn't pick up the right monitor profile, but after I set that, at least the output got consistent with respect to Safari and Preview.
God I am SO late in responding to this... Actually this wouldn't apply because the colors don't just look different in my browser, they look different in Photoshop itself once I save the image as a JPEG
If you're shooting digitally, the photo will almost certainly looks duller than it really is. It is almost a necessity for every digital shot to be further enhanced in a photo software (like photoshop, obviously), except in rare cases where duller means better
But i like this one, nevertheless. It looks "Journalistic"