While you can search other content using the search tool, it is mainly only useful for forums. Most of the time the various browse pages are MUCH better than the search page to find content. We didn't want people to think the search tool was the only way to find guides because it really sucks for that. So as a result, we only really show it in the forum section :)
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It's very well concealed at the bottom of the site. :)
I suggest you guys move it up top next to Builds&Guides.