With a tiny bit of effort by the user, any Google search can be
restricted to a specific site by adding the site location to the
search.  This works for _any_ web site.  For example:

  site:www.mmdigest.com "music box"
or
  "music box" site:www.mmdigest.com

I use Google Custom Search on a couple of my own web sites.  This is
a free service supported by small ads at the top of the search results.
http://www.google.com/cse/?hl=en 

Try it on my site:  http://efanzines.com/ 

Bill Burns
Long Island, New York, USA
http://ftldesign.com/