I know I do it in my search results here on this site, but you may not want someone to be able to frame your site in. Here is a line of code to eliminate someone from enclosing a page in your site inside a frame.
This script is easy to implement just one line of code.
<script language="JavaScript">
<!--
if (top.frames.length!=0) top.location=self.document.location;
//-->
</script>
What this script does is it checks the to see if there is any value of the location for the top most frameset. If there is a value for the topmost frame it then changes the value to the current location which would be your site contained in the frame. This code works with both Netscape and Internet Explorer.