The third element that makes up Google's new Web elements is Custom Search. Custom Search is another very customizable web element. Currently, Custom Search even has it's own blog, which you can find here.
You may be wondering what the difference is between the newly launched Custom Search element and Google's Adsense Search feature, since Adsense Search is already a customizable search option. For the most part, Custom Search has a lot more to offer. Like Adsense, Custom search is integrated into a website or blog via a html code. Custom Search allows a website owner to have complete control over what is searched. For example, Custom Search can be customized to show only specific web pages in results. Also, Custom search can include more than one website in search results. If you would like to include ads in your website's search results, Custom Search can work with Adsense for search.
The most impressive feature of Custom Search is the ability to be highly customized. If you remember, Adsense for search only allowed a webmaster to use a custom header image. Custom search has many customizing options that will allow you to blend search results with the overall theme of your website or blog. A specific examples can be found here.