http://hexmonkeysoftware.com/ <-- massreplaceit
actually instead of iwebenhancer, i would use massreplaceit. i've tried both products and they do EXACTLY the same thing (and it seems by the same methods too).
the big difference? massreplaceit is free (and more customizable AND can be used on more than just iweb)!!!
use it to add html, paypal buttons, google adds etc. etc. without using another html editor or going into your html files yourself.
i found out about this program through this website:
<a class="jive-link-external-small" href="http://">http://web.mac.com/will.englefield/iWeb/WillG4PB/Home.html
this website teaches the basics to iweb. honestly IMO if you are going to fiddle with iweb more than what is located in this website than you have pretty much defeated the purpose of iweb-> ease of use.