I couldn't help but notice that csharpfriends use the asp.net richtextbox control to enter in the text for submittin an article. I hope that they didn't pay to much it, because all it is a inline frame with the designMode property set to "On":
<iframe id="ifrm" width="100%" height="100%" name="ifrm" scrolling="yes"></iframe>
...
<script langauge = "javascript">
<!--
ifrm.document.designMode="On";

-->
</script>