Maybe I will do a post on it in the future. For me, that is simply a Google search bar.

You may want to look at http://draft.blogger.com. This is the site where they test out Blogger enhancements, and you can use them for your blog as well.

There is a search widget included in the widgets on that site, that you can easily include in your blog just like the other widgets. Try it out. I will have a look at it on my development site and let you know how it goes as well.

I would definitely look at using that seach widget first.

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