That would be a great idea for something to do, haven't come across a plugin yet but you might want to check this link out: http://b2evo-archived.waffleson.co.uk/plugins-and-widgets/

It has a lot of great stuff there

Thanks for that link - always good to have extra stuff to hand. Unfortunately, I've not found anything that addresses the requirement so for now I'm just adding the picture in manually.

There is this image_size thingy in the core, but i dont know how exactly it works, and i am not really satisfied with it.

Other than that there are a few jquery image resize plugins out there you could make use of

<?php
preg_match( '~<img[^>]+?src="(.+?)"~i', $Item->content, $matches );
if( !empty( $matches[1] )
{
  echo '<img src="'.$matches[1].'" style="width:80px;" />';
}
?>

Change width to suit

¥