The Google's Custom Search Engine team has made it easy to any site to add custom search. Google recently introduced Web Elements; the Web Elements are simple snippets of code you can copy/paste into your site's HTML.
From the Custom Search Element web page, I copied the code. Then in the Word Press control panel under Appearance->Widgets, I clicked to add a new "Text" widget, changed the title to "Search (CSE)" and pasted the code into the box:

Click "Done" and then "Save Changes" and that is it! You no need to register, sign up for anything, get a user ID, or anything like that. You can see the result on the right-hand sidebar of my blog.
Labels: Google, google features, google updates, New feature of google