Jumping in a bit late here (haven't posted in forever). I love the idea of this site. I'm appalled when I see clips of SB not only feeding a line of crap to grieving people, but actually being bitchy with them when they don't "see" things her way. The clip of her with the woman whose fireman boyfriend died on 9-11 is priceless. Just catch the look on that woman's face when Sylvia talks about him being in water.
Couple of things I thought I'd add, speaking as a journalist-turned-web-developer:
Be careful of trying to manipulate Google. They're getting ever more vigilant about anything that they view as SE spamming, and can drop your site from their index like a ton of bricks. Getting thousands of back links in a week could trip their "spam" meter--especially if your site has virtually no content. And once they drop you, they're merciless. Also, the site should be a bit further along before everyone makes serious attempts to promote it. You're going to get tons of back links (I'll be happy to give you a couple), but you need a real site when people get there, if you want them to come back and to link to you.
If you stick to purely factual material, you have a defense for libel. But just because they haven't a snowball's chance of winning doesn't mean someone cannot try suing you--and you still have to pony up for a lawyer, etc. Media outlets get nuisance suits constantly, which is why the major media keep lawyers on retainer.
Also be very careful about copyright. You can take bits of this and that under fair use, but what is fair use and what is not is not always well defined, and sometimes decided by a court. (I certainly wouldn't use YouTube as a guide, since I'm betting a good share of the stuff on there is being distributed in violation of copyright law.) It's always better to ask permission. I'm not sure if merely linking to, say, a YouTube video could make you liable--you'd need a lawyer to answer that.
In short, you're best off getting the advice of a lawyer before going after someone like Sylvia, who has money and strikes me as the sort who wouldn't hesitate to fight back.
Good luck, and let us know how we can help.