QUOTE (imipak @ Jan 14 2010, 01:58 PM)
Good grief. (Edit - not directed at 4th Rock's comment, but at the root cause being an MSIE bug.)
The color variation problem is not limited to IE. Firefox also doesn't support all the color space corrections it should do.
On the other hand, operating systems also have different profiles. Windows and Mac have traditionally different gamma values.
In practice, all devices should display/use sRGB or at least a good approximation of it. Therefore, an untagged JPG image will be handled as sRGB, and look "normal". Specifieng sRGB will make no diference.
Wide color spaces might take advantage of LCD capability in displaying more rich colors, but in practice don't work across an open medium such as the internet. Inside Photoshop, it's a diferent matter.
I sometimes use specific color spaces for certain camera/filter combinations, such as Voyager's OGV. The system converts data from those filters to sRGB in realtime, the same as it does for CMYK for examplo. But the final image must be converted to the default color space.