At the minute only had time to find these landing pages.
Get Landing Pages - We Make Landing Pages Easy.
It's a company that designs them.
Those are highly graphical.
You can also do it with a banner on top. A sizzle paragraph with benefits
and/or reviews. Then a call to action and a link. The main thing I read about landing pages is not to have nav links or any other links except the ones for that particular offer, so you won't lose people that click off somewhere else on your site and never click through.
Unless you are doing a PPC only landing page I think it makes sense to build some content and spider food into the page so you can hopefully get some natural search traffic.