How can I modify a post depending on the source of the traffic?

Not a wordpress questions really. You will get much better responses at stackoverflow.com. However you instigated my curiosity… you can get the referral url by using the following javascript: document.referrer You could add that to your current AD script to check if the document.referrer == “some url” before displaying the ad. See more examples here

How to non index my website page links?

WordPress comes with a built-in feature that allows you to instruct search engines not to index your site. All you need to do is visit Settings » Reading and check the box next to Search Engine Visibility option. When this box is checked, WordPress adds this line to your website’s header: <meta name=”robots” content=”noindex,follow” /> … Read more

Google Apps Domain for WordPress

Jamie, do you already have hosting for your WordPress site? And to be specific, is your WordPress site self-hosted, or are you using WordPress.com? If I understand your question correctly, you will need to point the domain name you purchased to your hosting/server. Depending on where you are hosting your site, you may have access … Read more