Okay, after taking a little look at the original plugin (simple_news), I realise that it's all about the way you format your "posts".
Turning off HTML processing
Changing Edit -> Additional Settings -> Process HTML to 'Off' seems to do the trick (your mileage may vary).
Simple News Hacking
Figure I may as well leave some plugin hacking advice whilst I'm here.
For my journal, I added the following to simple_news to allow for breaks/jumps (any text after the comment tag <!-- break --> will not be displayed on the plugins listing page.
Example: -
$s .= substr($page['content'], 0, strpos($page['content'], "<!-- break -->")) . "...n";
Download the tweak and see if it's of any real use to you.
For iframed and jQuery guides, etc, check this thread for some resources.
Hope this helps.
Peace.