>Is this a script that should only be installed one per
>server? Or can there be more than one installation and each
>run without problems.
Many folks are running multiple installs of Fatty without problems.
However, ANY script can overload a server, it all depends on how much traffic you have and how many resources you have Fatty search.
If using Faty as a page maker, I suggest converting the pages to static HTML using of the methods I've described to greatly reduce server strain.