I've done a lot of research into improving the Google Quality Score for client PPC campaigns.

Better Quality Score means paying less for PPC clicks.

The top factors affecting your Quality Score are:

1. Account history
2. Average CTR (Click Through Rate)
3. Landing Page load time
4. Quality of incoming links pointing to landing page domain
5. Keywords/Description Meta tags and Page title
6. You need 6 Must-have pages (You need a Privacy Policy, Contact us and Terms & Conditions page)
7. Keyword density (Use https://adwords.google.com/select/KeywordToolExternal to make sure Google views your landing page as relevant for the target keyword)

By continually working on imporving your quality score, you'll be able to slash your PPC costs dramatically.

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One of the easiest way to improve your landing page quality score, is to populate your page title and meta tags with the target keyword.

All you have to do is extract the keyword a user is searching for, from the referring URL and populate your page TITLE and meta tags with that keyword.

The code below does just that:

Definitely an interesting thought at the end. How does this affect indexing? Or is there just an assumption that the page will only be used for PPC and not meant to be indexed?

In general, a search engine spider probably won't be using a referrer string, so it would index very different content. Which could possibly raise concerns of cloaking.

Hi Craig -

You're right about a search engine spider not using a search query. The content of the page will still be the same but the page title and meta tags different.

I didn't find any problems with this approach but as always, do your own tests.