I have created an AppleScript to manage unrelated iWeb sites (projects). When I say unrelated, I mean that you may want to create more than one site on different host servers, or even the same host, all of which have nothing to do with each other. iWeb does not allow you to manage unrelated web sites -- it will also Publish/Export all of them at the same time if you have edits in more than one of them.
I published a hint and the applescript on Macosxhints.
To find out more, read the hint here
The latest Script can be found here.
Note if you are using file Vault the script will not work for you.