Digg recently introduced url shortener. This is not your standard url shortener where the shortener does a 302 forward. Digg shortener displays destination site in a frame. Which means the reader still stays on the Digg.

Most of the modern web analytics software will be able to record this visit, but it will problem in finding out the actual referrer.  Also standard traffic counters like alexa don’t count this visit against your site.
So if you don’t like to that DiggBar to be displayed on your blog.  You can add this one line code to your site. Add it to your webpage’s head section.

<script type="text/javascript">
if (top !== self) top.location.href = self.location.href;
</script>

This code in fact doesn’t allow anybody to display your content in their frame. Here is the demo url http://digg.com/u1BSW to check. It should work on all browsers.
Let me know if you have any other suggestions.