It’s somehow a little bit useful to have bing search engine integrate to your website. I just create a plug-in for wordpress regarding this. This plug-in is designed to be a right panel widget. If you need, just download the ZIP file and upload to your wordpress plug-in, activate it, then you can arrange the widget on your right panel.
You can also define the title for this plug-in: you need to setup the search site, if you don’t, then will be the current site. Please note that “http://” is not needed as shown below:
On the right panel, you can see the bing site search widget is activated:
And when you type in the search bar with your keyword, you will see the search result:
Simple and easy, just go to open source section: http://blog.koumei.net/open-source/#bing