Do we? The spotlight effect works fine in IE 9 standards mode.
I took the liberty of unpacking the Spot script and altering it slightly:
I was a little disappointed to see that browser sniffing was employed. I devised a means test by declaring the canvas variable earlier and then testing for its getContext property instead of $.browser.msie. That worked to allow IE 9 to display the effect If IE 9 was in standards mode as it is given this page:
Armed with this knowledge I would be inclined to either just wait out the death of IE 8 and less or use IE conditional comments to conditionally use one script or the other.
<title>Standards Compliant Spotlight Demo</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<!-- JQuery Core -->
<!-- JQuery Spot-PlugIn -->
<img class="spot" src="Tri%20bhuana%20tungga%20dewi.jpg" style="width: 420px; height: 599px;" alt="" />
Edit: Added Later:
While testing this it appears that the packed version of the script doesn't work at all in IE 8 and less. Not even the square spotlight appears. It works OK in IE 9 in IE 9 mode, IE 8 mode and IE 7 mode, but not in the actual IE 8, 7 and 6 browsers.
For what I was saying before about using a .png image, see:
Oh, and here's a way to combine the filter approach with the modified jquery.Spot.js script: