I wasn't sure whether or not to post here or the hacks section, but I figured that this was most appropriate.
To start off with:
This obviously is an issue because it does not extend to the largest user base (some work computers that use older versions of IE can't access it properly either)
I realize some of the other features like box-shadow and text-shadow may not be visible in older versions, but that's not really the most crucial; the biggest part is the grayscale effect. Even if it was possible to achieve grayscale without the CSS3 fade effect (just going from grayscale to color) would look better than just having the images in color.
The website for reference is Kaitlyn Payne Photography
I'd really appreciate any feedback at all.