"Landing Pages for organic traffic are very different from Landing Pages for PPC"

While I don't disagree completely Gianluca, I'm from the camp that believes every page on a website should be treated like a Landing Page. It should be able to guide the visitor to a desired action.

The reasoning behind this is  that when a site recieves organic traffic,  there's no way to ensure that the visitors will enter your aite where you want them to enter.

That's the rationale behind my stating that PPC best practices are equally valid for organic.

Hi Mike: I'm not sure this answer will be specific enough, but it will address some of your question at least. I wouldn't separate your landing pages from your site for starters. If people end up linking to them, you want that juice to flow into your site. It will also enhance usability and enable the visitor to discover other parts of your site.

Each of your LP's should have a clear call to action. You are paying for every visitor so make sure you get your best return on your PPC spend by crafting the best LP you can, and then test. test. test them with A/B testing to optimize your  results.

While this advice holds true for PPC, it's equally valid with best practices for  organic traffic.