Every Wordpress blog has a search box somewhere on their blog, either on the sidebar, header and in some cases the footer, however as you might have known posts Wordpress search is restricted to postsonly and that’s not really good especially if you're using wordpress with a chunk of pages and posts.

The Search Pages 2.0 plugin you can now allow your readers/visitors to search both your posts and pages.

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Search Pages, Plugins, WordPress Plugins