I am also having this problem. IE7 keeps caching the movie the second it
recognizes the same filename.

I am actually passing a var at the same time though, and wasn't sure how to
get javascript to send the randomNum to the filename in the page. In the header
I have...

<script type="text/javascript">
var randomNum;
randomNum=Math.random();
</script>

the current embed looks like this

<embed src="resources/flash/hnweb_projects.swf?projectNum=-685" ...etc.

I tried using
<embed
src="resources/flash/hnweb_projects.swf?projectNum=-685&ieCacheClear=randomNum"
....

Obviously my usage of the variable is flawed... I just haven't written
something like this before. I would prefer to keep this out of an external js
file.

Any suggestions?