I remember seeing a show about this when I was young, I've always loved the story. Thanks for helping me remember it. Here are a few more links I found.
This first one is a couple of accounts of the experiment,
http://www.navalships.org/eldridge.html
This next one is a site with a lot of information about it. They call themselves "Philadelphia Experiment From A-Z". I haven't browsed the entire site yet, but I plan to after posting this.
http://www.softwareartist.net/philexp.html
Edit: Oops, it appears that last link is just a really large plug for a book. My apologies