Amazon is breaking comments

I posted this in the Plugins forum, but it might be more appropriate here:

I started my blog about a month ago. I’ve been tinkering around with it, adding google and amazon ads to the sidebar and in posts. However, I noticed yesterday that putting an Amazon link directly in my post breaks the comments system. In fact, I think it breaks everything after the Amazon link, because my site no longer displays “Powered by WordPress” or my Site Meter at the bottom of the page.

Example page:

8bitninja.com/2006/04/14/8-bit-ninja-feature-tetris-ds/#more-37

I review games now and again, and I usually post Amazon links to each game I review. Usually, I just paste the Amazon link code right into the post HTML using the HTML editor.

I think it might have something to do with wordpress converting the Amazon iframe into a self closing tag?

BTW, I have the WP-Amazon plugin, but the links it generates don’t look nearly as nice or professional as the official Amazon links.

I know there are a zillion posts about Amazon ads but I couldn’t find anybody with my specific problem.

Any help would be greatly appreciated.