Best "Loading" feedback for ASP.Net?
- by IP
So, we have an ASP.Net application - fairly standard - and in there are lots of updatepanels, and postbacks.
On some pages we have 
<ajax:UpdatePanelAnimationExtender ID="ae" runat="server" TargetControlID="updatePanel" BehaviorID="UpdateAnimation">
    <Animations>
        <OnUpdating>
            <FadeOut Duration="0.1" minimumOpacity=".3"  />
        </OnUpdating>
        <OnUpdated>
            <FadeIn minimumOpacity=".5" Duration="0" />
        </OnUpdated>
    </Animations>
</ajax:UpdatePanelAnimationExtender>
Which basically whites out the page when a postback is going on (but this clashes with modal dialog grey backgrounds). In some cases we have a progressupdate control which just has a spinny icon in the middle of the page.
But none of them seem particularly nice and all a bit clunky.  They also require a lot of code in various places around the app.
What methods do other people use and find effective?